I'm not saying I have a strange sense of humor, but everyone around me definitely says that—a lot! Some things just make me laugh, and I can't really explain why. It's not that I don't know what's funny about them; it's just too hard to explain to a normal person. I would have to explain two, or maybe three different fandoms, and then draw the connection between each of them to explain why an image is funny. By that point, it's not funny anymore.
I've always been like that. My friends would tell me a regular joke about some guy going into a doctor's office, and I would perhaps crack a smile so as not to offend them. But then I would see some incredibly obscure image of a shrimp frying rice with the caption "Rice Fried" and I would burst out laughing. It makes no sense.