Judy laughs!

After Judy says "Well of course not." Then watch as she tries to use Terry to cover up her giggles!

Trivia.
While filming the scene where Dorothy slaps the Cowardly Lion, Judy Garland got the giggles so badly that they had to take a break in shooting. The director, Victor Fleming, took her aside, gave her a quick lecture, and then slapped her. She returned to the set and filmed the scene in one take. Fleming was afraid that this would damage his relationship with Garland and even told a co-worker he wished that someone would hit him because of how bad he felt, but Garland overheard the conversation and gave him a kiss on the nose to show that she bore no hard feelings. In the film she can still be seen to be stifling a smile between the lines "Well, of course not" and "My, what a fuss you're making".