Added some karma points to my total this morning.  I was depositing cash from selling a computer and noticed that the teller had written $500 when I’d given her $400.  It occurred to me that the extra $100 was likely untraceable: once it was in the till, and written up as $500, I can’t see how they’d be able to show I’d only deposited $400.  But my better angels won out, and I suggested she recount the bills before putting them away.  I did expect a little more praise of my honesty than I got (“Well, that’d would’ve been a nice way for you to start your Friday morning,” was all she said), but I guess I’ll have to get that from you folks in the comments.