Hey Nate.....Which site do you play on most often? If it is Pokerstars
then you could get into some serious trouble. Jacks are what I call an "iffy" hand. You like seeing them when you are short stacked but later on in tournies when the blinds are high and there are only a few players to be knocked out until you make the money, they can be a pain. If you are a big stack and the short stack goes all in in, you should call but only if you plan on losing. Jacks are common in most races. AK usually sucks out against my Jacks. To get to the point, definitely play Jacks aggressively but beware of getting reraised preflop and the flop coming out all low cards, most of the time they turn over QQ or higher, just be careful when faced with a reraise.