How Many Sales People does it take to Screw in a Light Bulb?

How many salespeople does it take to change a light bulb? Three possible answers:

• None, ”You don’t need a new light bulb – you need to upgrade your socket to the newest version.”
• Just one, but it’ll take technical support weeks to sort out the mess left behind.
• Four, One to change the bulb and three to pull the chair out from under him.