Not that anyone would realy know, But I thought it might be amusing to think of things that would make them laugh.
For instance, Do they think its funny when a bird craps on your head?
Or to see you running around the house looking for your glasses, when the whole time you have them on top of your head?
If you were an alien. What about us do you think would amuse you?

You bet them little buggers have a ense of humor! Why do you think they use anal probes for! Not to mention that with their superior knowledge they know we have to be up in the morning for work and yet they still insist on kidnapping us in the middle of the night.

Us trying to communicate with them via radio waves.

Or people having sex

By far the funniest thing about us is our sexuality. Ever thing from the faces we make to the fact that we mock and hurt people then turn around and do the same thing behind closed doors. come on a whole nation got wrapped up in a controversy about a woman having her boob pop out during the Superbowl a few years ago.
If our ingrained immaturity about sex would be funny to a more advanced society then I don't know what would be. I'm almost 30 and I still find the word tit funny! now that's immaturity!

I think they would find it funny that people like us waste so much time on ATS. They know that we don't know they exist but they know that they exist and know we can't prove it. Little bleeders (can I say that?)

'Little Bleeders'... Yes you can say that.
I know a guy who was abducted, I dunno if he was
abducted lots of times or once... he just told me of
this time.

He told me in a bar, about two years ago and from his
stricken expression, I think he'll told me the truth.

"The bed was cold and metallic" he muttered and then
he went on...

The Gray came in from a space in the wall that sealed
as soon as the thing stepped forward. Greg tried to move,
but his eyes were the only thing that functioned.
The thin figure looked down without any expression and
somewhere in Greg's mind he heard a voice.

"See, here's the pulse. And this is your finger, far away from
the pulse, jammed straight up your ass. Say, would you like
a chocolate covered pretzel?"

Greg gulped and closed his eyes.
Later, the Gray waved his hand and an aerial view of Sherma
Illinois was seen and The Gray seemed to titter to itself.

Makes you think nuh?

I don't think they have a sense of humor.

In fact, I think that's one of the reasons they are so interested in the human race because to them humor may be a long lost quality that they are no longer capable of experiencing.

Maybe they want to re-experience this again??