Actually, I often hide the fact that I have the monster in a ring game, because I want them to call me next time I have a monster and bet big. Although I don't really do this at penny tables ...

Also, I've been outkicked with trips multiple times before in cases like that. Actually, very ironically, I joined a $5 MTT there just after this, and like the 4th hand in on the SB I get knocked out by the BB with two 9s on the flop, and getting outkicked with the trip 9s.