During the filming of Indiana Jones and the Last Crusade, a tense situation arose between Sean Connery and a member of the movie crew. The annoyed actor then threatened the special effects technician.
One of the more recognizable lines from the Indiana Jones movies was fully improvised. Sean Connery decided to deviate from the script for a moment, which caused the whole team to have a fit of laughter.
In an interview, Harrison Ford explained what Lucasfilm had to do to convince him to reprise the role of Indiana Jones four times.