Eh…this may be a bit inappropriate, but I had two schlongs. It was freaking me out! I couldn’t believe I had gone my whole life without knowing.
Ack…I should have caught that one. 
Well, I saw a GG1 (a very famous [in railroading circles] electric locomotive) in Lehigh Valley Railroad paint in a dream. (They were only ever owned by the Pennsylvania Railroad, Penn Central, Conrail, New Jersey Transit, and Amtrak) It seems like a small thing to miss, but the last one was retired in 1983 (I think) and I’ve been able to tell that I’m in a dream just from the numbering of a locomotive (e.g. I saw a K4s locomotive numbered 5573, when the last one was numbered 4599, and became lucid.)
I know, I’m weird… 
EDIT: Oh, and once a plane (I think it was an A380 or a 747-400) smashed into me during a dream.
I´ll start at the point were I missed the dreamsign(s):
I was walking back to school with some random DC friends. I stopped at a road sign. On the pavement in front of the road sign walked a dark green monkey with a big red arrow in his hand. The arrow pointed at the road sign. It has the form of a stop sign and in big red letters was written on it:
With every single Lucid Dream you will get a higher level of consciousness
I turned around and said: I have never seen something like this on a road sign…whatever let´s go back to school…
Shortly after that I woke up and couldn’t believe that I missed it… 
Last nite i dreamt i was watching tv and an ad for a movie called ‘the lucid dream movie’ came on and i didnt realize it. 
Just last night…
I got onto the plane, which was actually a wooden broom, with a solid broom end, that was then a canoe. The propeller on the front started spinning and I flew around in circles waiting for my dad to come out of the building (which actually made sense because, although I don’t even have a fragment of the previous dream segment, I know that I had just done something in the house and then come out) that was my house. When he came out he put the luggage in the luggage compartment in the broom stick and then got on. Then I took off and the landscape turned into a map-like drawing, and somehow I crashed into the leaves of the tree that was below me on the map, yet above me at the same time. After I landed on the ground in the crater created by the crash, unharmed, I found a police sargent waiting for me in the middle of a bamboo forest… need I go on?
EDIT:
Well even if I need to I cant because then I can only faintly remember the sargent questioning me, then I woke up 
EDIT2:
I just thought of another one:
Aside from the fact that my mom had prairie clothes on (light blue bonnet etc.) and was running across the wooden bridge across the narrow gorge away from the soul eating monster about 10 stories high who had two numbers on his chest (like some sort of Japanese fighting game boss) and was eating my dad… Previously I had let my two dogs outside, and then they had come back… with 5 identical twins each. I chose the ones that I thought were the most likely to be the right ones, but I chose one wrong so that when I got inside it spoke in an evil voice and told me that it was Dr. Frankenstein (or a creation of him…)(a reference to an EXTREMELY scary dream from when I was 11) then it showed me a flashback to when it was created (or when it created something…) in a creepy laboratory and to make a long story short I screamed and ran away from my dogs when I saw them in the morning…
…It was a year ago and you weren’t there 
A while ago I had a dream where I was in a park and there were large pools of chocolate in the ground. I said to myself ‘I wish I could experience this in a lucid dream’ (!)
Gasoline was only $2.06 per gallon at every gas station I passed.
I was flying around the country side with huge wings and pikachu floating beside me … 
It’s weird like that; I went to Roanoke and gas was $1.85. I did, like, 473 RCs after that.
I looked at myself in the mirror and left eye looked blind and was infected. I thought: “I should really take a closer look at that when I wake up.” And continued dreaming as if nothing weird was going on.
I was in a building with my sister and we wanted to go to another house for some reason. I thought about walking there and then said: “Nah, that would be a waste of time. Let’s just fly.” I then actually went looking for a window and did not think it unusual at all… 
seeing myself sleeping 
I have been doing digital watch RC for about five months (I try to do it hourly while awake).
In a dream I am shopping for new digital watch. I look at several, but I never do a RC with them 
I have been having pretty normal dreams. There pretty much just me doing something I would normally do its just I don’t ever do a reality check.
I cut out a piece of rubber tree, and I thought “hey, I got that from Monkey Island!” but even realizing that I’ve repeated a scene from a computer game wasn’t enough to make me lucid
Some old lady had no eyes. I mean come on NO EYES! And I didnt realise I was dreaming AURGH! 
i was riding a bike wearing a heavily padded wetsuit with this kid i really hate. and we “parked” our bikes in a place that had alot of bees (thats why i wore the wet suit).
/me puts a tick in the “school during summer” box
Well, this is the first week after school’s out. (Note to self: if I’m at school, I’m dreaming.)
(Wait, does that mean that all of school was just a dream?)
Oh and we were in this neighborhood that i havent even been n, in atleast 2 years now. and the neighborhood was changed alot. and the fact that i was there and didnt go to see chris or Jacob makes it even less real.
/me thinks he won an award…
Most rediculous missed DS.
A cross-dressing banana. He had a good sized beard, wore a red dress and red high-heels. AND was running faster than me while I was going full speed on a bike. And I’m pretty fast on a bike