speaking of jumps to 3NT, my favourite, from the Red Ribbon Pairs in Toronto:
All red, MPs:
LHO Pd RHO Me
1D 2H! 3NT P
2H - 6-12 HCP, 5+hearts, *any hand*, but we are allowed to pass with 8xxxx and a 6-count vul :-).
After 4H, LHO screamed - literally - three times for the director, claiming I had hesitated, and partner bid. Partner pointed out that 3NT was a skip bid, and I *always* pause ~10 seconds after a skip bid (as I am supposed to!) "But he didn't use the stop card!" says LHO.
The TD quietly explained to this pair the skip bid regulations, especially that part of them that said that I was allowed and expected to take my 10 seconds no matter what the situation, no matter wha the opponents did with the stop card.
After he mananged to calm them down, the auction continued X-all pass; it was extremely hard to keep a smug smile off my face as I put down xxx xxx Jxxx Qxx; even my opponents realizing I had absolutely nothing
to think about.
It was even harder to be smug when partner, with 5620 and a decent 10-count, lost 4 tricks for a clear top...
Sometimes it pays to be ethical :-)