The ones where the op is pregnant and doesn't know who the father is, then goes on to list dates and times of 2-3 different men.
I swear it's the same thread resurfacing every 4-6months, as it reads almost exactly the same every time.
The Brian from Hull one was hilarious! unfortunately didn't make it to classics because it was so obviously a troll but it was funny.
There's a couple at the moment that just have me WTAF
Also the ones that the OP strops and flounces because they don't get the response that they want, and tell anyone that disagrees or gives an alternative view to what they want to hear to not both posting.