Children, presented with the first half of a well known proverb, came up with:

1.Don't change horses until they stop running.
2.Strike while the bug is close.
3.It's always darkest before Daylight Saving Time.
4.Never underestimate the power of termites.
5.You can lead a horse to water but How?
6.Don't bite the hand that looks dirty.
7.No news is impossible
8.A miss is as good as a Mr.
9.You can't teach an old dog new Math
10.If you lie down with dogs, you'll stink in the morning.
11.Love all, trust Me.
12.The pen is mightier than the pigs.
13.An idle mind is the best way to relax.
14.Where there's smoke there's pollution.
15.Happy the bride who gets all the presents.
16.A penny saved is not much.
17.Two's company, three's the Musketeers.
18.Don't put off till tomorrow what you put on to go to bed.
19.Laugh and the whole world laughs with you, cry and you have to blow your nose.
20.There are none so blind as Stevie Wonder.
21.Children should be seen and not spanked or grounded.
22.If at first you don't succeed get new batteries.
23.You get out of something only what you see in the picture on the box
24.When the blind lead the blind get out of the way.
25.A bird in the hand is going to poop on you.
26.Better late than . . . . .pregnant.
27. As you shall make your bed so shall you ... mess it up.
28. It is better to light one candle than to... light an explosive.
29. You have nothing to fear but... your Principal.
You have nothing to fear but... homework.
30. If you can't stand the heat... don't start the fireplace.
If you can't stand the heat... go swimming.
31. I think, therefore I... get a headache.
32. Early to bed and early to rise... is first in the bathroom.
33. A journey of a thousand miles begins with a... blister.
34. There is nothing new under the... bed.
35. The grass is always greener... when you leave the sprinkler on

Deep thinking for a teenager:

The only stupid question is the one that is never asked, except maybe "Don't you think it is about time you audited my return?" or "Isn't it morally wrong to give me a warning when, in fact, I was speeding?" --Age 15