What do you find hilarious but most people don’t find funny?

Some girls often ask me this question "What do you find hilarious but most people don’t find funny?" I don't know that I'm their crash or not but I feel that they are weak. I don't know what is the answer to this question? for this, I always try to talk to another topic. So I need to know the answer to this question. Please, someone, help me. My question is -  What do you find hilarious but most people don’t find funny? Thanks.