Re: Ice cream meltdowns. I recall an unusually warm spring day at the Lincoln Park Zoo in the 1980's. The Good Humor trucks were down to their least popular items. The resulting meltdown, littering sidewalks all over the zoo, lives on in my memory as the Great Frog Massacre. It was quite grotesque until we established that it was, in fact, ice cream, and neither unfortunate amphibians nor odd polymers boiling out of the ground.