Discworld series

It goes HRUUUUGH!
It is a hippopotamus!
That's not my cow!

ITT, Discworld. My favorite in the series remains Thief of Time, but there's a lot of close seconds.

Favorite book? Character? etc?

okay, never touched any of the discworld series before. however i am fairly interested to buy one. heaps of them are available at the discount book store.

anyway, where's a good place to start?