Squigly Squigly's Brain Teasers

Question:

How can you take 9 toothpicks and make ten without breaking the toothpicks?

Answer:

TEN (every line making the letters in the word ten is one toothpick. There are nine lines you draw when writing ten, so there are 9 toothpicks making TEN).

Try another Brain Teaser:

Jack tells Jill, "This isn't the $5 bill you left on the the table. I found it between pages 15 and 16 of Harry Potter."

Jill retorts, "You're lying and I can prove it." How did Jill know?