Odds Of A Flopped Two-Pair Running Into A Flopped Set.

[Solitare]

Scenario: In a $33 tournament you are in the big blind with a garbage hand (two different cards) and check to 2-4 limpers. You flop two-pair on a flop with three different cards. What are the odds that one of the limpers flops a set?

Feel free to make an assumption about what types of hands the limpers are limping with. Or probably more importantly, what % of time each limper has a pair.

I have gone out of three tournaments this way in the last three days. I'd like to know at what level I should set my self-pity dial.