I've screwed this one up too and maybe one day I'll even play it right. If simmy13 isn't in the big blind and/or has a taller stack, this is a call on the river after being raised. Either he really liked that 7 or you've both been slow playing and the fireworks just got started. Hmm... that puts him on 2 pair or better QT, Q7, Q4, T7, T4, 74, but more likely AA, QQ, TT, 77, KJ and you got the worst of it.