I mean really laugh! Every time!
With my DD, it's her stinky poops. LOL She thinks it's hysterical when it's time to change the diaper and she pooped. She knows when she's pooped. She knows when she's stinky! And she thinks it so very funny.
It makes her laugh and it makes me laugh.
If she has a poopy diaper, the moment you lay her down on the changing pad, she starts to grin. Then you strip her, and she starts to giggle. You undo the diaper and tell her "Woo!!! You are so STINKY!" and she erupts into this deep belly laugh. If mommy and daddy "argue" over who changes the poopy diaper, that gets her laughing too. If mommy hits daddy with said poopy diaper (in a diaper bag, of course), she just laughs and laughs and laughs.
If you even put your face down near her bottom, then look up at her and tell her "You are so stinky!" She'll start laughing.
She is so funny! We tell her all the time that she's just like her Grandpa, loves to be stinky and proud of it!