In Grease (1978), what appeared to be a simple milkshake scene reportedly took an unexpected turn when Stockard Channing decided to go off-script. Instead of th

In Grease (1978), what appeared to be a simple milkshake scene reportedly took an unexpected turn when Stockard Channing decided to go off-script. Instead of throwing the milkshake toward Frenchy as planned, she sent it flying at Jeff Conaway. According to behind-the-scenes accounts, Channing had be…