You have the opportunity with:
opposite a known ♦AKQx or better and ♠A but unknown club holding to bid a grand in a teams competition. Partner gives some UI which implies he didn't realise exactly what he'd shown.
You settle for 6 and make 7 when your partner's club holding turns out to be Qx. Opps were in game.
What if partner's club holding turned out to be xxx and the Qxx was offside ? Opps now call for a ruling saying that you should have bid 7 and used the UI to stop.
Your real reasons for not bidding 7:
Opps have already demonstrated by going for a love all 500 that should have been 800 on a partscore board, failing to bid a decent 4♥ and going off in a cold 4♠ that you don't need to bid the grand, and will probably pick up just for bidding the small. You are also confident (wrongly) that you're already winning this match at least 16-4 (this is board 5/7, you were actually only winning 13-7 before this).
How do you say this without offending anybody ?