I was terrified of a movie called The Tingler w/ Vincent Price when I was a kid. Just saw it again recently and it was so funny. The original of The Blob is worth a laugh too.
Both of those terrified me when I was a kid - I remember them from "Friday night/ Horror night" on TBS (back before it was a National channel). My mom about killed me when she found my "slime" (remember that stuff?) in the freezer because I was scared it was going to est me, LOL!
I loved (and still do) all of the "Abbott and Costello meets..." movies. Those are lots of fun!