I love most of the old musical bits, but there was an animated short music video called "Carefully" that scarred me for life. In it, a kid is running down the hall and then a dracula pops out at him from a broom closet or something.

Of course, it was meant to be just one of a long list of situations in which one must proceed 'carefully,' but I was deathly afraid of vampires and closed doors for years.