A couple more, almost done.
1. Time passes quickly, (or straight and predictably), like an arrow.
2. Measure the speed of flying insects the same way you would measure the speed of an arrow.
3. Measure the speed of flying insects that look like arrows.
4. Measure the speed of flying insects really quickly. (ie. don't take too long to do the measuring.)
5. "Time-flies" (a rarely known species of insect) are fond of arrows in general. (Well done 'jamdfingr'

)
6. "Time-flies" (a rarely known species of insect) like a particular arrow. (How is this different than '5'? Think of "Jim likes a beer" and "Jim likes a girl")
7. Life is short. Measure the speed of flies, be fond of arrows. (Brilliant 'needsalt'!

)
8. There's an American Indian who is really fast. They call him "Flies like an arrow". Go and measure how quickly he can run the 100m sprint.
9. It's about time flying insects gave up their prejudice against arrows.
Not sure if anyone is really interested, or if I'm just boring you all to tears. 'Green thumb' this post if you want to know number 10...it's a real doozey!!