I'm sure this has been done before, but here's how it goes- First person names a person, place, thing or whatever (MST3K or Rifftrax related) that starts with the letter 'A'. Next person, the letter 'B'. Ad nauseum. After you get to 'Z', it starts all over again at 'A'. Extra nerd-points for double letter posts, such as~
A - Alphabet Antics