There's the famous one about a decade ago with Lou and Andy from Little Britain doing a comedic skit in the background of an otherwise normal scene, which must have seriously confused anyone who weren't familiar with Lucas and Walliams. Annoyingly the Youtube clip seems to have been blocked in the UK, but Dailymotion
have a copy.
Michael Palin randomly showing up on Home & Away in the 90s (while he was filming a travel documentary in Australia) is one we can thankfully still enjoy.
Member since 26 May 2001