I know a fella this happened to, but with lamb instead of beef. He excused himself and ran to the nearest boots and bought three boxes of laxatives. He necked all three boxes, ran back to the restaurant but only ate the vegetables, carrots, broccoli, cabbage etc. Then he waited and waited and waited until he was shaking, climbed up into the air conditioning shaft and crawled around until he found the managers office. He said, serve me overdone lamb will you? And dropped his guts through the fan onto the managers head. Then he paid the bill on his American Express card and went home.