ME!
Mikeberg, if you are ever handcuffed from stabbing someone with that thumb, use your thumb to cut them in half.
Or, if someone can't find the scissors to cut wrapping paper, you would be a hero.
WHAT IF SOMEONE NEEDS TO CUT VEGGIES FOR A FINE STEW AND A KNIFE IS NOT READILY AVAILABLE? DON'T WORRY, HIS THUMB IS SHARPER THAN A GINSU KNIFE.