I've fallen into a Maury addiction when I haven't got lectures. The paternity ones are clearly the best, "9th Man Tested...Will We Find The Father?"
And you've always got the guy protesting his innocence while the camera zooms in and out intercut with shots of him shaking his head.
Though one I saw recently was a bit much. It was one of those "My Teen Is Sex-Crazed And Out Of Control" ones, and this 15yr old girl was accused of performing oral on a lad on the school bus. Another girl told her mum, that mum told the girl in question's mum etc.
So the build-up was the usual: tearful mum, shocked audience, footage of girl saying she's innocent. She came out, the audience did their usual booing, and she just burst into tears. Utterly distraught. Turns out she hadn't done anything, which caused the audience to quickly change their minds and applaud her.
Worst Maury episodes: "Is It A Man Or A Woman?". Worst BY FAR.
Edit: I forgot to mention my very favourite bit!
The lie detector results crack me up every time. It's never just a simple yes or no result.
"You were asked if you've ever had sex with an older man. You said no. The lie detector test determined that was a lie, you've slept with a 25 year old"
Mighty fine machine you got there! Then they have the lie detector guy in the audience and he says the reading was "very high"!