1. Eating it with arsenic
2. Sky diving with it as a parachute
3. Cooking it on gas mark 900
4. Stuffing it down your windpipe
5. Inserting it into your eye socket
6. Shoving it up Lennox Louis' nose
7. Giving it to Saddam Hussain as a present
8. Using it to garnish a meal (Oh that's not dangerous)
9. Throwing one up into the air and catching it in your mouth with a brick attatched to it.
10. Using it to pull out a pin on a grenade that is primed to explode straight away.

See also 10 Things to Do Which Are Dangerous That Just Happen To Involve An Orange
From Doodle Book 'As You Don't'. By Derek. I recall doing this at an assembly in sixth form at school