Two. One to assume the ladder and one to change the bulb.
A': None. If the government would just leave it alone, it would screw itself in.
or
it was Wedgie Kray.
or
Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years.
or
Drinking, bathing, washing, swimming, etc.
or
Bike helmets don't fit hippos
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Two, one to call the electrician, and one to mix the drinks.
or
Because he wanted sweet dreams.
or