10.Food preparation.
9. To collect them as functional art.
8. To clean/trim your fingernails.
7. For self defense/survival.
6. To open envelopes.
5. To cut off loose thread from your clothing.
4. To open blister packages.
3. To open bags of potato chips.
2. Knifesturbate "click, clack, click, clack..." :)
1. To open boxes that arrive from the brown van that contain new spydies!