With a stack of 3000, 50/100 blinds, I was holding:
2 4 (not suited)
I'm big blind in a heads up game. Opponent matches the big blind, so I end up playing a hand I'd never play otherwise.
3 3 5 (Rainbow)
I see a straight draw, which is pretty nice. Something around 32% if my odds calculations are right, plus potential outs with the remaining 2s and 4s, if he has something like AQ (meaning against a nonpair, I have 14 outs, which is in the 50% range, minus some for possibly hitting his pair also). Plus the fact that there aren't cards much higher than mine - so more likely he doesn't have anything matching the table.
I bet 200, making the pot 400 at this point.
He moves all in, which is only about 2x pot size (and about half of my total stack). Assuming I don't know anything about past patterns - is this an automatic 'match' or 'fold', or is this in the 'it depends' category? If I take his bidding at his word, is this suggesting a particular hand?
His all-in was equivalent to a raise of 1200 for me, so the pot was 200+(my 200) + (his 1400) for total of 1800 at this point. I'd be risking 1200 to win 3000 (and left with 1500, half my original stack, if I lose).
At the table, I put him on a higher pair (pair of Ts, say) and folded (as the straight draw itself seemed like a bad idea).