Over my 6C my opponent (who knows me) paused for a while, then said, "I guess I believe you," and bid 6S. I still think that's the best way not to get saved against, though. Apparently I still have more work to do convincing people I'm a maniac to avoid this problem. :( One of the amusing ways to get above average on the board was to play 5H after a revealing auction since reasonable opponents were afraid of pushing you to the slam.