(Clips at that link illustrate the technique well.)
Were you at Neil Hamburger's show at the High Noon Saloon last night? We were. Let this fuzzy iPhone pic prove it:
Or did you make it to "RiffTrax Live: Plan 9 from Outer Space"? We missed that unfortunately, but had a lot of fun laughing at Neil Hamburger and his painfully bad jokes — and JP Inc. and his theme songs for TV shows that don't exist.