Killing ants?

[thistlechaser]

Anyone know a good way to kill ants? Preferably a way that will make them suffer? (Just joking on that second part...) They're coming in the heating vent in the /ceiling/ in my bathroom. I talked to the super for our apartment building, but she said if they're not outside all I can do is buy spray and spray them. (When they were coming in from the outside she had some super-strong poison stuff that killed them right off.)

They haven't made it to my kitchen yet, but it's not a long walk to it... and my cat's food is between them and the kitchen.