I never had the chance to play Sinistar in the arcade, but I certainly played the hell out of it on Sega Genesis, and that mother could send shivers down my spine. Well here he is in cake form, and he's looking just as scary as ever. I remember him yelling at me to "Run, coward!" -- and I would, I would totally run. Straight down the hall to hide under my bed with a fresh load in my pants.
Thanks to TetterkeT for the tip, and Happy Birthday!