[ProllyInfamous]

I once had a local credit union teller accidentally place my cash deposit into another person's account. An hour after deposit, I didn't see my checking account reflect the cash addition, so I checked the deposit receipt and the account number wasn't mine.

When I returned, this teller had already corrected her mistake (but I entered fuming/livid). She is now the branch manager and has been extremely helpful/attentive ever since.

[ckdarby]

Once had a teller deposit in my account 1,000,000 instead of 10,000.00.

Noticed as I was leaving. They kind of nervously laughed and fixed it.

[BizarroLand]

If you get a $990,000 bank error in your favor you should try to stay mum about it, lol.