Workers at the Corona brewery in Mexico urinate in the beer vats.
 
False. This persistent rumor started in the mid-1980s and spread like wildfire, costing Corona millions of dollars in lost revenue. The brewery was finally able to trace the slur to Luce and Sons, a competing Heineken distributor. A lawsuit coerced Luce into publically admitting that urine was not in fact an ingredient of Corona. Corona has since spent over a half a million dollars trying to squelch the rumor, without much success.