Not me, but my twins when they were in a pushchair. They stole a card from Clintons. I didn't realise till we were home and didn't want to spend hours walking back to town (didn't have a car back then, double pushchair was too big for the bus) so kept it.
They also stole a big bar of Galaxy from the local shop. I realised as I left the shop, so ran back in and handed it back.
Both things were in reach of their pushchair, and having a double meant it was hard to keep them away from things in grabbing range!
They are teenagers now, and apart from nicking my chocolate have not turned into master criminals. Or they're really good at it and haven't been caught yet! 