He didn't use enough force...
Someone who knocks on your door for no apparent reason.
A polite bulb.
A force of habit
Obi-Gyn Kenobi.
Because the majority of their relatives used to pick it
A flirtation device.
As soon as you open it, you realize it's half empty.
A joint venture.
Letterhead and envelopes. No matter how hard you try, they remain stationery!
It has a dark side, a light side, and it holds the universe together.