I like the wine tasting one best, because you can see that Sacha is absolutely wasted after downing all of the wine at the beginning.
Borat is genius.
EDIT:
Borat:
How do you stop retard boys coming in and… enjoying the dogs
Dog owner:
You just have to be responsible, be careful
Borat:
Does this happen?
Dog owner:
It can, it has
"Can I collect spermatazoa?". My god, this is too funny.