At least two, but they have to be pretty small to fit.
Find out next time on Dragon Ball Z***
Is the lightbulb plugged in sir?
5,6,7,8!
Doesn't matter. Lightbulb is going to die anyway.
Fitting the wheelchair in the oven.
Nun.
One to screw in the lightbulb, stock four carts of supplies, and handle seventeen simultaneous customers at any one time for five consecutive hours.
A Mars Bar