Last night I was walking downtown and I stumbled upon the filming of my favorite moment of one of my favorite guilty-pleasure shows on MTV: My Super Sweet Sixteen. There was a mob of teens outfitted in slutty prom-y dresses and braces, camera crews, and a nice shiny car and sea-doo parked out front of the Francis Marion Hotel — either that pivotal moment right before or after we find out if the kid is going to throw a fit because daddy got a blue BMW instead of black. I wanted to stop and gape but my bf wasn’t nearly as impressed as I was and continued dragging me down the street. I ran across a blog that said Cobra Starship was the surprise guest. I always see cool things when I don’t have my camera…