There's a movie called "Top Secret" (that's the name of the movie, I'm not trying to cover up anything) released in 1984, starring Val Kilmer and directed by the Zucker brothers and Jim Abraham. It's one of those satires, making fun of spy movies and along the lines of "The Naked Gun" or "Airplane" where all sorts of weird, wacky, non sensical things happen in the background and you actually have to have a sharp eye to get some of the jokes, though most of them are pretty bad or overdone.
There's a scene where Kilmer and his lady costar are in a park and they spot a couple of german guards about to walk past them. Since they're being sought after by the law, he kisses her passionately so the guards think they're just a couple in love while they can hide their faces this way. While they're kissing, you can see in the background a large statue of a pigeon. Three men drop from the top of the screen waving their arms like they're flying down, they land on top of the statue and start peeing on it. When the kiss is over, you can see them waving their arms again and flying off. I never got the joke in my early teens, but laughed when the pigeon statue poops in the background after Kilmer and his costar are gone.
Fast forward 25 years later. My brother has bought several old movies we enjoyed as kids and I borrow some from him (including Top Secret) and find out... I pretty much had a stupid sense of humor back then since a lot of the stuff we saw wasn't even that funny. Stuff that you think it's awesome as a child should very well be left alone, because your adult, mature brain will ruin those memories if it's ever exposed to them again (unless we're talking classic video games!)
I sit down to watch Top Secret with my wife. She doesn't even laugh once and we start making fun of my taste in movies as a kid. Then the pigeon statue scene pops up and I tell her I never got the joke as a child and she says "Well, pigeons poop all over statues of humans, so now humans are peeing all over the statue of a pigeon"
"BWAHAHAHAHAHAHAAAAA!"
I slapped my forehead and was actually laughing at myself for needing assistance to catch something so simple and silly. I feel pretty dumb just typing this and not getting it the first time.