Mine was Liquid Generation's "Mc Escher". I ran to a room and covered my eyes for half a second. However, it could have been that or "Kikia" (S_S_O on a website I found back then). Reason for that weird name: The website disguised it as a guessing game (It's supposed to say susto, portuguese for scare). Same reaction on the screamer btw. It's either of them that were my first.