USS Enterprise Crewmembers Lightbulb

Q: How many members of the USS Enterprise does it take to change a light bulb?
A: Six.  Scotty to get on the intercom when the light goes out and say, "I canna do it, Cap'n!".  Spock to tell Kirk he is proceeding illogically.  McCoy to say "Dammit, Jim -- I'm a doctor not an electrician!!"  Kirk to screw it in and two red-shirt security officers to die in the process.

What Would Elvis Be Doing Today?

Q: What would Elvis be doing if he were alive today?
A: Scratching like hell to get out of that box.

Chromosomes

Q: How do you tell the difference between male chromosomes and female chromosomes?
A: Pull down their genes!