Two that come to mind - my parents had this dog, Tootsie, that would eat anything. She was very bright, for the most part, except when there was food involved. She was also a weird mixed breed - looked like a cross between a bulldog and a yellow lab, and was very stocky and only about 10" at the shoulder and had a small head.
Mom set a trash bag on the back porch one afternoon, meaning for one of us to take it to the big can (it was apparently pretty stinky, and she needed to get it out of the house). Tootsie found it first, and managed to get her head stuck inside one of those industrial-sized boxes of Goldfish crackers (the ones that look like large milk cartons). She was running around the back yard, bumping into things, and getting the corner of the carton stuck in the dirt if she didn't hold her head up high enough.
Dad finally chased her down and took it off (we were dying laughing and couldn't stop long enough to get her) and as soon as she got the thing off, she started these running sideways slides (looked like she was sliding into home base, on her face). Mom and I were convinced she had picked up the idea from the box (they had been taken to a baseball game the day before).
Second one - I had a group of friends I hung out with in high school. Some of us had cars, others didn't (I did not). One of my friends, LuLu, was a drag queen (he still performs professionally, and makes good money at it). He was my first gay friend, and helped me come out to my parents (the fact that I'm a lesbian is important to the story). Another, Mike, was a cancer patient, who had lost his right leg (above the knee) at an early age due to his treatments. One evening, we decided to go hang out together. LuLu came and picked us up - and off we went to one of the few things open that late in the area (it was almost midnight) - the 24 hour bowling place. When we got out of the car, I said that we were a joke looking for a punchline. The guys asked me what I meant. I said "A lesbian, a drag queen and a one legged man walk into a bowling alley..." We ended up getting back in the car and leaving, we were afraid we'd get thrown out for laughing so loudly.