BB: So, who here has a guinea pig?
Various Audience Members cheer
BB: What kind of guinea pig?
Muffled suggestions from audience members
BB: Nah, you're not serious about it! (Imitates guniea pig owners) "I dunno, some brown thing...". So what breed?
Audience Member: Crested!
BB: (misunderstands) A what? A crusty...a crusty guinea pig? (Imitates owner) I think you should take it to the vet as soon as possible! "Gah, it's crusting over again, it's crusting up Captain!!" (understands) Ah, crested? What you have there is a newt I think, madam! Some bloke in a pub sold you that! (as man in pub) "Yeah, that's a crested guinea pig, they're lovely, them..."