Maybe it was funnier at the time, but I'll try...
Girl from uni: "So I'm trying to represent the unification of graphic design and illustration by using a cow with half of it sketched and half drawn in Illustrator. Half one thing and half another, you know, like that thing in Napoleon Dynamite."
Me: "Umm. Oh, the Liger!"
"Yeah! That's it."
"That reminds me of the zedonk. Ever heard of that?"
"Huh? I don't think I have."
"It's when zebra and a donkey are bred. You get a zedonk."
"Really? I've never heard of that."
"Yeah, it's crazy. Except they're born sterile, so they can't breed. Which is why you don't get millions of zedonks running around."
"But if they're born sterile then how can they be...how can they exist?"
"Uh, because the zebra and donkey...have...sex."
"...oohhhhh."
Me: "Umm. Oh, the Liger!"
"Yeah! That's it."
"That reminds me of the zedonk. Ever heard of that?"
"Huh? I don't think I have."
"It's when zebra and a donkey are bred. You get a zedonk."
"Really? I've never heard of that."
"Yeah, it's crazy. Except they're born sterile, so they can't breed. Which is why you don't get millions of zedonks running around."
"But if they're born sterile then how can they be...how can they exist?"
"Uh, because the zebra and donkey...have...sex."
"...oohhhhh."