you can call 2 cold with some good multiway hands when there are a lot of people cc'ing before you, and/or you expect loose blinds, such as ATs, TJs, 33-88, etc. etc. Hands like AJ and KT are bad to call for raises, even multiway, as they are likely to be subject to domination. Bigger hands like 99-AA are good 3-betting/isolating hands, esp if pfr has big cards.