Only happens in photo shoots. Normally the stars avoid looking at the camera when they are filming.

Cameron Mitchell

Maureen O’Hara

James Stewart

Vivien Leigh

Clark Gable

Ann Sheridan

Marlene Dietrich, Herbert Marshall

Fred MacMurray

Cary Grant

Richard Widmark
It’s called breaking the fourth wall. One of the very best examples is when Ferris Bueller (Matthew Broderick) appears onscreen and tells the audience to go home.
I am the person who sits in the theater until the very last credit rolls. Typically, there are only a few people left as most everyone else exited when the movie ended.
All of those who were in such a hurry to leave missed this very amusing tag.
That’s it – the fourth wall – it was shattered in LADY IN THE LAKE!
Thanks for the funny video. I bet only a very few folks saw it. Well done!