My friends little sister is a clepto:

Friend: (Name not given for privacy issues) comes down to ask me if i want lunch

and then she's like oh man my butt hurts, i have to poo

can i poo in your bathroom?

i was like sure, but don't take anything

Justine: hahahaha

what happened

Friend: she said i won't and then ran off to the bathroom

haha she just came out and said "oh man i took that nastiest do-do"