How can I measure 12 inches without a ruler?

Related questions

1. What is smaller than an inch?
2. Is a 7mm lung nodule big?
3. How many inches is a quarter?
4. How do you calculate decimal feet?
5. What is the difference between metric and standard bolts?
6. How many cemeteries are in an inch?
7. How do you write 4 feet 9 inches?
8. How do you know if your fingers are long?
9. How do they measure TV inches?
10. Does mean inch?

Tags

1. #roughly
2. #knuckle
3. #check
4. #thumb
5. #measure
6. #between
7. #without
8. #dimensions
9. #great
10. #ruler
11. #quick
12. #length
13. #double
14. #handy