That happens so much around here. I wonder if they are attracted to the charge or if the first ant was unlucky and the subsequent ants were following the scent trail? I do not know how exactly that works, but each subsequent ant lays down more scent making the trail stronger. Seems to me some clever entrepreneur could make a better ant trap, using this phenomena. Low charge ant bait. I need one for those little crazy phantom ants in my house. They work all night messing up my kitchen. a ray gun would be nice. You all work on that!