Two. But I don't know how they got in there.
It's a mystery.
A completely rational fear.
None because There is A Light That Never Goes Out.
Only one, but it takes nine years.
Just two, but how they get in there.. I don't know. (Stolen from an old Maxim in my dad's storage)
Two. One to screw in the lightbulb and another to sing about all the good times they had with the lightbulb.
Nothing you can't cross a vector with a scaler.
A mosquito can fly, but a fly can't mosquito.