I've heard many of the 8 pages worth I've seen here, but I'll give some more that I've heard. Born and raised in northern Indiana, lived in CO, eastern PA, southern NJ, grad school in TN, lots of relatives in FL, so God only knows where I've heard them. lol
Dumb as a skunk; two logs short of a load; it's hot enough to fry eggs on the driveway; I need that like another hole in my head; like a fish out of water; not the brightest bulb on the tree; sharp as a tack; blind as a bat; that is bass ackwards; cute as a button; he/she is a little wiggle britches; too many bats in her/his belfry; they are two peas in a pod; he/she doesn't have the brains God gave a goat; he/she doesn't have the sense to come in out of the rain; and many more.