I can sit through stand ups like Dave Chappelle, Chris rock, Peter Russell or any number of Adam Sandler/Ben Stiller movies without even cracking a smile, but c

I can sit through stand ups like Dave Chappelle, Chris rock, Peter Russell or any number of Adam Sandler/Ben Stiller movies without even cracking a smile, but can roll on the floor laughing after looking at silliest of stuff that not many find funny. I could never figure out what and more importantly why a certain situation/picture/pun makes me laugh.