Funny in bad taste.
Like the saying from a tv talk variety show from the 50s - 60s... "kids say or do the darnest things"...
Funny but not... cute but not really.
So your teenage grandchild, over which I hold much negative influence, does something that they feel is hilariously funny.
They quietly silently release the most god awlful fart...
Then say "does anyone smell popcorn?" And without thinking, the rest of the family takes a deep breath through their nose, checking for the smell of popcorn... only to have the sense of smell blatantly attacked by the most obnoxious smell possible. Then all you hear is hilarious laughter. What a twisted sense of humor. And why does the rest of the family, all of them, look at me like I had something to do with teaching them this kinda stuff.
Then they look back the the offending child and she says... "poppy taught me"... Which I most certainly DO NOT! But who is gonna believe me? No one! Go figure.
Then there's the other saying... if you are going to be accessed of something that you didn't do... you might as well live up to their expectations and go ahead and do it!
So... There you have it. Funny... but not really.