An onion
or
A scale.
or
I find you very attractive.
or
The price of bacon would go up.
or
None, because they were copycats
or
Just one, but he/she will spend hours checking for technical problems.
or
The price of bacon would go up.
or
Two. One to take out the bulb and drop it, and the other to try and sell it before it crashes (knowing that it's already burned out).
or