How about butt inflation?

maybe they get there pants stuck on something and it shows off there big bouncy butt

Butt inflation!

I got a few ideas

Manual inflation (by just using a tank to make their butt bigger or just blow into their thumb like some cartoon characters do)

Sudden (self explanatory)

Walking, lieing down, unaware (butt stands out but they dont realize it)

And...thats all i got. Hopefully this helps.

Do one of Loney's butt getting inflated while he's asleep.

Try doing one of Loney getting his butt inflated by someone. (At least try to make a new character.)