Is this the worst common play?

[Bob T.]

Today, I was playing in a game with a weak loose player to my left. He just had to see the flop, but if he missed, he folded like a house of cards. I think about four or five times we had this sequence.

I open raise. He coldcalls. Two to the flop.

There is a flop.

I bet, he folds.

Including the big blinds money, he is getting 6 to 1 pot odds right now. What hand could you reasonably or even unreasonably cold call with, that you aren't at least a 1 to 6 underdog with on the flop?

So my guy is making two mistakes here, he is coldcalling, and probably coldcalling loosely, and then, unless he coldcalled with 23 offsuit he probably has enough outs to see the turn at least. I just see this sequence all of the time, and whenever I do see it, I know that I have a player that is ready to be taken advantage of in a lot of different ways.

If you ever see yourself doing this, I think that you have one huge leak that is easy to fix.

Comments? any other common plays that seem to be always wrong?