Last summer, Hubby noticed that a few toads would gather under the bug zapper. I guess to them it was a bbq. So every night he would run the bug zapper for a couple hours. We got so many "resident" toads he had to quit, you couldn't walk anywhere without stepping on them. Around dusk, the ground came alive with toads headed for the bug zapper. When he quit running it regularly, it only took a few days to get back down to the normal few toads we see.
In 1993, when it rained incessantly and all the flooding was going on, there would be waves of baby toads crossing the roads and you couldn't do anything but put tire tracks across the mob. Our son called them flatheads, as in, "last one across the road is a flathead!"