Could I write a couple for you? Well let's start with one, I might get bored / run out of ideas after one!
Dieting
ALAN: Hey Dave, I'm thinking about going on a diet.
DAVE: Huh? Why would you need to go on a diet?
ALAN: Have you seen that skeleton roaming around? He's really slim, looks in great shape.
DAVE: ... He's a skeleton...
ALAN: Yeah. So I was thinking about Atkins or maybe that weird cabbage diet everyone's talking about, what do you think?
DAVE: I think you're trying to emulate an un-dead, fully-decomposed corpse.
ALAN: So?
DAVE: So, you're a pumpkin.
ALAN: Are you calling me fat!?
A New Pet
ALAN: Hey Dave!
DAVE: What now?
ALAN: Guess what Dave...
DAVE: What.
ALAN: I got a new pet today!
DAVE: It's not another pig is it? The last one chewed half my face off.
ALAN: No, it's not a pig. It's a dog!
DAVE: A dog? There aren't any dogs in minecraft.
ALAN: Sure there are. They're everywhere, they're super friendly, but they do make a mess which makes people mad at them but they are so cool and cute and...
DAVE: OK! Where is this dog?
ALAN: I'll call him. CHARLIEEEE! HERE BOY! THERE'S A GOOD BOY! COME ON!
*tssss*
DAVE: OMG You idiot!
(Creeper runs up and explodes)