This is a very silly peeve but when Storage Wars and Storage Wars Texas have the auction winner go, "Oh, what's this?" and pull out something then...they cut to commercial. Now I WANT to see what it is so I'm flipping around and flipping back to the show every 30 seconds to catch the "exciting reveal" of whatever garbage (or not) the person has found.
I also hated on What Not to Where when Carmindy would spin the fashion victim around to reveal her makeup makeover and...cut to commercial.
It is an effective technique but soooo annoying.