
I believe I'm normally a fairly quick player - I usually have a range of appropriate bids stacked up, while waiting for opponents and partner to call, and covering most eventualities. Similarly when playing.
But very occasionally I have to hesitate. While doing so, a few days ago, I inadvertantly let my fingers touch the PASS cards in the bidding box. This was called out by one of the opponents, apparently it was a breach of etiquette or whatever (though I can find nothing in the Laws about it). He claimed I might have been signalling UI to my partner thereby. He said he was in half a mind to call the TD (though he didn't).
What the Hell!? We were in a competitive auction, we'd been bidding Spades and the opponents Hearts, and the bidding had reached 5♥ against me. It was a tough choice: I knew 5♠ wasn't making but would 5♥ make? So my only options - as my partner knew perfectly well - were 5♠ or Pass (or possibly Double - but that was unlikely). Wouldn't anyone have hesitated, with that tough choice? Surely by fingering the bidding cards I wasn't passing any UI to my partner? I may have broken the rules, but to what effect?
Anyway, if the opponent's intention was to intimidate me, he succeeded. In a fluster I passed, then made the wrong lead against 5♥ which was then made; when we could easily have got them down...