Not only do Ant'n'Dec have the ability to rip it out of celebrities/popstars and get away with it, they certainly don't mind ripping it out of themselves aswell. The pair originally met playing PJ & Duncan in the children's program "Byker Grove" (oooh Byker oooh byker oooh byker byker byker byker grove yeah! Ha ha, ha ha, ha ha) which was pretty fantastic if you were the right age for it. 

Since they were cast as best friends they actually became best friends and have been ever since. Their next 'strategic' career move saw them topping the charts as singing/rapping pair PJ & Duncan. Now I don't really remember much about them but they must have been pretty bad if the lads can take the mickey out of themselves, but give them their due they did write their own songs and made 2 albums (I think).