In keeping with the "alien" theme, I thought this one appropriate.
1. What do you call a spaceship with a faulty
air-conditioning unit?
A frying saucer
2. Why are aliens messy tea-drinkers?
With flying saucers, it’s hard not to spill it
3. Where do Martians get their eggs?
From the little green hen
4. What are aliens’ favourite sweets?
Martian-mallows
5. Why don’t aliens celebrate Christmas?
Because they don’t like to give away their
presence
6. What do you call an overweight ET ?
An extra cholesterol !
7. Two astronauts went to a bar on the moon,
but they left after a few minutes ? You see, it
had no atmosphere!
8. Two atoms are walking down the street and
they run in to each other. One says to the other,
“Are you all right?” “No, I lost an electron!”“Are
you sure?”“Yeah, I’m positive!”
9. Q: How many radio astronomers does it take to
change a light bulb?
A: None. They are not interested in that short wave
stuff.
10. Two aliens landed their ship on a golf course
and watched a young man golfing.
First he hit it into the high grass, mumbling and
cursing he retrieved his ball.
Then he hit it into the sand bunker shouting curse
words he retrieved the ball.
Next he hit a perfect hole in one, then the first
alien said to the second, “Uh-oh cover your ears
he’s going to be really mad now”!