post flop anyway...c-bet then fold or check-fold if they're still in there. someone who's really really tight, from being there myself will be willing to take a monster pretty far against you. i've found once they're hip to you're game, and if you're ahead, if they raise you back...raise them again if you have the chips if it won't commit them to the pot (unless you are pretty sure you've got this one). against someone really tight...its often not the amount you've bet (especially against just a sissy), but the fact that you HAVE bet that will run them off pots. be willing to lose a few chips and seem almost predictable. i like to have them thinking the same way i do sometimes...."just let them bet this time, i'll show em!"