Light Bulb - Reagans

Q: How many Reagans does it take to change a light bulb?
A: What light bulb? Note: Topical to Reagan's apparent poor memory.

Light Bulb - SAS Programmers

Q: How many SAS programmers does it take to change a light bulb?
A: They can't change light bulbs... Without light, they can't read the manual, and without the manual, they can't figure out how to change the light bulb.

Buffalonians to Crew in Lightbulb

Q: How many Buffalonians does it take to screw a in a light bulb?
A: Two-one to get the new bulb out of the snowbank, and one to screw it in.