Watch Roy Welland. He's a master of misleading bids. My favorite...
LHO Sabine RHO Roy
1C 1D X 3D
Roy held something like KQTx AJTx Jxx xx. The opponents managed to get to 5C in a 5-2 fit. Both misjudged the fit that Roy and Sabine had. LHO continued ...
I asked a director about this, once. I was told that you're not allowed to have any partnership agreement about what to do over opponent's illegal call. It seems that this would include psyching they're bid.