This dialogue happened between me and a ten-year-old student who has a pet bird.
Me: OK, that really just needs a little more practice; I can't really say anything else about it. I mean, I can, but I don't need to.
Student: Yeah, you could say that it sounded like it was coming from the bird and that she was trying to talk through her tail!
Me: ...talk through her tail...
Student: It's like in this book (Terry Pratchett's Wee Free Men) where this one character says something about "...them sayin' my playin' sounds like a spider tryin' to fart through its ears."
Me: I could say that, but it wouldn't be nice. Or true.
Student: But it would be funny!
Me: Well, yes.