In the second grade, a dentist pulled my tooth with no anesthetic. It had been hanging by a thread, and while I remember the pain being immense at the time, it was quickly subdued by a visit to the dental office's toy box, where I found a sticker and a small bottle of bubbles.
The dentist handed over my tooth, too, and told me to put it under my pillow. The next morning, it had been replaced with a dollar bill. Rewards for making it through an uncomfortable situation with as much strength as my 7-year-old self could muster.