Put out some Real Kill ant bait. Just watched an ant come out of the little thingie with a piece of bait in his mouth, walk to the edge of the counter, toss the bait in the trash can under the counter, clean his antennas, go back into the bait thingie, and come out with another one, and toss it in the trash.
After I got through laughing I did him a favor and tossed the rest of it for him.
Anybody know of any ant bait that _works_?