I have a lot of love for these:

The jokes with no punchline thread by chunty
http://drownedinsound.com/community/boards/social/2167501

iPhone question by sarkyfox
http://drownedinsound.com/community/boards/social/4146399

What's the longest amount of time you've waiting between getting up in the morning and going for a poo? by bamos (mainly as it's got my finest post ever in it)
http://drownedinsound.com/community/boards/social/4193210

These are all classic meths threads:

which 118 do you use?
http://drownedinsound.com/community/boards/social/2660059

take any pair of breasts in the world: would you rather SEE both or TOUCH one?
http://drownedinsound.com/community/boards/social/4198676

who wants to start a band with ME?
http://drownedinsound.com/community/boards/social/4192667

What are your favourites? Do you have a favourite post ever? Are you as bored at work today as I am?