Assume SAYC and for the purposes of this question, Geeber, RKC 1430
The scoring is Matchpoints, and both vul, if it matters.
You pick up the above hand and are trying not to drool over it when pard opens the bidding with 1C ! Our bidding went :
1C - 1D (me) - 1NT
At this point, we had no real "gadgets" available other than trying 4C and checking for aces and then kings, or RKCing. My worry with 4C was not being sure what pard would take it as (he told me later he would not be sure it was Geeber); as for 4NT, I thought he might take it as quantitative asking him to bid 6 or pass, and if he pegged me for 16-17 pts, he might well pass with a min 12-13 point hand. So I paused for 10ish seconds and bid .... 6NT, ending the auction. We were cold for 7 as pard held :
AKx Kxx xxx Kxxx
Ideas on what the heck to do with a hand like this? :-) I thought of bidding a variety of confusing (hopefully forcing) stuff like 3S, 4D etc. fwiw. Maybe I should bid an immediate 4NT and on hearing 5C (1 or 4 kcs), bid 5N and then onto 7NT from there.
Thoughts / criticisms appreciated!
-G

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