When it's intercepted by a separate plane.
Interactive Joke of the Day Mug
Coffee Mug
When it is intercepted by a plane.
Intersect it with a plane.
Because it's grounded.
Can I crash at your place
5. 1 to screw in the light bulb, and 4 to remark on how grand the old one was.
Because it's dangerous to shoot for 3 or even 4.