| Always on the full amount.  If the service is solid, 20%.  If it's really over the top - keep going.  And always round up.  Also, don't be afraid to tip less.  I've even written something on the slip I sign if service was bad and I tip low. 
				__________________If you're wringing your hands you can't roll up your shirt sleeves.
 
 Stangers have the best candy.
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