Well not here in the Philippines...hahahaha...But honestly it rarely happens to me...Most of the time, it is the change that I always have to return if the cashier or the seller mistakenly given me more than he/she should...I once paid a bus ride with P20 and he's just supposed to give me a change of P8..but he mistakenly gave me back P38 thinking I gave him P50..I returned the P30 immediately.