Only one, but with a perticular FETISH
Two. Ant-Man and Wasp are the only ones small enough to fit inside a lightbulb.
3, a person, a ladder, and another lightbulb
None, it's a hardware problem!
None. They like to keep their subscribers in the dark.
Their knees. (Not sure if this one translates well to english)
Have you seen the mess snails make?
The feet
A quarter-pounder with cheese.