As it happens, I fell victim myself yesterday, but it wasn't my fault! I'd doubled my RHO's 1
♥ opener for takeout, and my partner passed it out - ostensibly for penalties. I was already a bit suspicious before my lead, since I held
♥K6 myself, and I could only watch ruefully as declarer made +2 when there was a good game for us - and a complete 'bottom' in IMPs....
Experience again! My partner was very apologetic after I (tactfully) explained the problem afterwards. And I would have really
LOVED a redouble from RHO, but it wasn't to be...
I suppose I could have asked for an UNDO, but I don't like UNDO's. I think I learnt my bridge under the firm principle, what's bid is bid; what's played is played: no going back. And I recognise the immense value of BBO, a (mostly) friendly environment where you can stay on good terms with both partner and opponents and enjoy bridge in the best way it can be enjoyed. I don't like stepping outside the box, so to speak. Also yesterday, I felt a bit embarrassed when my partner (a different one) asked for an UNDO after opening 1
♥, which was given, and then amended their bid to 1NT. I felt I might have been shown my partner's hearts in a way which I wasn't entitled to (assuming it wasn't a mis-click). I told the opponents this, but they laughed it off.... Very decent of them.