I love parlor tricks

1. Grab a calculator
2. Key in the first three digits of your phone number (not the area code)
3. Multiply by 80
4. Add 1
5. Multiply by 250
6. Add the last 4 digits of your phone number
7. Add the last 4 digits of your phone number again
8. Subtract 250
9. Divide number by 2

Dig that.