Have always been curious of this.
Because it's dangerous to shoot for 3 or even 4.
Malaysia Airlines only has been shot down once.
Reflect! I use this dadjoke on my pregnant wife every day when she goes out for walks after dark and wears a safety vest.. 'Now honey, don't forget to reflect on all sorts of things, especially car headlights!'
A: One after reflecting in the twilight on the merit of the previous bulb.
The bartender replies, "For you, neutron, no charge."