[BluffTHIS!]

If you've marked yourself as having AA and a draw heavy board comes, then a lot of aggressive players will try to bet you out of the pot when first to act or reraise you with a pair and a draw. So if you want to take a stand occasionally to keep yourself from being abused, and can reraise allin, then doing that isn't bad sometimes. But they will likely always have outs and sometimes will have actually flopped the joint too. Sometimes with these types of players it's actually more menacing when they check to you when first to act as they are slowplaying. You will be more correct to do this HU than multiway when such a player is more likely to have it, and even if he doesn't could be running you into the nuts held by another player yet to act or who checked in first position. And the moral of this of course is not to play mediocre AA hands too strongly preflop .