I hope this turns into a thread!
What were the worst (or best, depending on how you look at it) "jump the shark" moments in TV? If you haven't heard of the term before, "jump the shark" describes the moment in a television show when it begins a decline in quality that is beyond recovery.
Here of some examples of mine. Feel free to comment and add to these as you wish!
Gilmore Girls: April - I get that they needed something to cause a conflict in Lorelai's and Luke's engagement, but did it have to be with the most annoying girl ever?
How I Met Your Mother: What exactly is so great about Ted? It's like he is this AWESOME guy and the WHOLE reason why he is not married yet is that the perfect woman hasn't come around. I've thought he was a jerk. At least Barney is honest about who he is.
Sex and the City: When it became evident how self-absorbed Carrie was.
Buffy the Vampire Slayer: When they brought Buffy back after she died.
7th Heaven: Day One - . I would say when those twins were born.
Six Feet Under: When Brenda just wouldn't go away.
The Office: They should have had Jim and Pam get together at the end of the series.
Roseanne: When the show stopped being about a working class family and started being about how great all the women were and the men were the most incapable people around.
So, what's yours?