Do rats laugh? No way to prove it. Did they like it? I don't know, let's just ask them! :D

This could be faked very, very easily, but I realy want this to be true

Rat tickler. Best job in the world?

The luckiest lab animals in the world.

Oh Hee Hee Hee! Oh Hee Hee Hee Hee Hee!

This is the first time I've ever seen rats as something other than food for other, better animals.

Drop in a picture of tubgirl and listen to their suicide cry

They probably make the same sound when you stomp on them

You're sure the sound isn't rat for "knock that the hell off"?

I think they'd just escalate to biting if they were really annoyed.

I love rats.

and they /did/ ask them. and the rat spaketh and its will /was/ manifest. hail, n.r.o.s!

Look at them chase his hand around! Obviously they want more belly scritching.

If you hang them upside-down by their tails and tap their stomach with a ball-point pen, you can make them fart.

Awwww.... I used to have a rat that looked just like the tickled one there.

CHI-CHI-CHA-CHOR is how Transformers laugh

rrrrraaatts!

my rats love getting bellyrubs.

Flipping a rat on its back is a dominance gesture. What they're likely saying is, "Okay! I give! You're bigger."