Most of mine come from my childhood... My brother got the bell rung at Farrell's twice in one night when he ate two banana splits. He was eight at the time.
My favorite custard is Kohr's on the Jersey Shore. We only got it every summer when we visited the beach for our vacation. Now I'll just run up to the boardwalk and get it.
Having lived in Chattanooga, I'll put in a vote for Clumpie's as well. Great ice cream and a great view of the renovated Chattanooga downtown. Bruster's, which can be found in most "larger" towns in the south, is pretty darned good as well.