See if you can admit to doing something morally wrong, the game is that you then don't give reasons or try to justify it
For starters, an old flat mate of mine had 2 £400 matresses turn up by mistake so I bought one off of her for £100.
There wasn't a single part of me that didn't understand that I was receiving stolen property.
I'm the opposite. I've been given too much change by a shop or been given an extra item I hadn't paid for, come home, realised the mistake and gone back into town and given the money and goods back. Found money too and handed that into the police station.
I sometimes put greasy plates in the sink after wiping them clean with a Kitchen towel. My missus goes absolutely mental that she has to wash yet another towel.
i done a car boot a few weeks ago and sold a plasma telly an xbox 360 and a mobile phone for £100 to some bloke at the carboot knowing none of them worked......... i did not feel guilty though as he had a leicester shirt on. (true story)..