Renyatta

I think that's almost impossible with the way Jeff stands there saying - if anyone wishes to use the hidden immunity idol, now is the time.

Trix, Yul used the idol to lure Jonathan across to the Aitu 4 after the merge, saying basically if he votes with Raro tonight he'll be gone because Yul had the idol and would play it. I count it as a different scenario because Yul's idol was far more powerful. It could be played after the vote so it didn't require any great secrecy. Threat was also made back at camp. The scenario I made up (which you can almost guarantee is wrong) is the exilee waiting until tribal and making out during the pre-vote discussion that he intended to play the idol.... even though he didn't have it. That's the kind of thing I would do to save my ass if needed. If everyone fell for it and changed their vote accordingly, that's a pretty big blunder I reckon.