The worst-played hand in Texas holdem is 3,2 suited. The danger is you may actually complete your draw and bet big -- 3,2s can only make the lowest straight.
Danger hands are poker hands that you shouldn't play, but do because they look seductive, fun or profitable - until they get you into trouble.
If you're playing a No Limit Texas Holdem tournament and you're dealt 8c3h in and that danger hands before the flop can become nightmares after it when. How to Play Texas Holdem Poker : Good Starting Hands in Texas Holdem