When Eli Wallach’s character Tuco unearths the gold hidden in the cemetery, the crew applied acid to one of the bags of gold, so that when Wallach hit it with his shovel it was guaranteed to split open on cue. What the crew didn’t explain to the actor however, was that they were keeping the acid in a bottle that once held a brand of lemon soda that Wallach enjoyed. Wallach saw the bottle and took a sip, thinking it was his favorite drink. Luckily, he realized his mistake before it was too late. Avoiding a truly horrendous and tragic accident.