I think I may have found it:
Tickle scene
youtube.com/watch?v=BbhKCpyHUSU
Full episode (the scene above starts around 26:37)
youtube.com/watch?v=VrsniKHjaxQ
Here's the other scene. The better of the two IMO
youtube.com/watch?v=4ORTu51DNz4
at 1:08
Does anybody got the videos? Sadly the links do not work. I'm willing to trade something if anyone finds it.