How to “act weak”?

[Hellmouth]

Most times I try to act very even and not worry too much about trying to "act" a certain way.

However with a monster hand the following sometimes works with an agressive opponant. I did this last week at commerce. I had pocket KK and flopped KK. I was bet into and I called to slowplay. Several others called as well. The turn came down a blank and as I raised. All the players dropped out except two. The agressive guy reraised. Instead of capping, I looked down at my chips and made a very small nod as if I was trying to steal the pot with my raise and by being reraised I had been called out. Then I only called the three bet rather then capping. On the river I again raised and this time capped the three bet. I would have kept raising for ever but I had the guy all in at that point. I think that I made an extra two bets because instead of capping on the turn and getting check called on the river, my play allowed me to cap the river.

Has anyone else tried this?

Greg