The usual suspects..A_anything,suits,connectors..
The most dangerous hands are the ones that "might get me going, possibilities.." Ace_anything, connectors of any sort, suits, and the big pairs(A-Q). I think the reason people play these possibilities hands is: your opponent almost always seems to hit with those hands, when you have a favored hand, pre-flop.
It gets into the realm of "It's my turn for the hand to play out for me.."