Scene Suggestions: Being watched

Hello.
I am doing some research and need some help.
I am looking for scenes in which a character is being watched. The character senses that they are being watched and looks up, but the watcher has now disappeared.
I am sure that this is a widely used trope but I am struggling to find examples in film or TV.
Any help would be very much appreciated.
Thanks in advance.

Not exact matches:
Absolute Power - Laura Linney's character talks with the federal agent in her dad's apartment that she always thought he was watching her from afar and sees photos of herself in his apartment. She does eventually figure out her dad's in her apartment when they arrive there, but he does reveal himself once the agent leaves.

Psych - Maggie Lawson's dad tells her of important events in her life to show he's always been around her but didn't openly attend so his bad traits didn't corrupt her life.

I love the bit in Scary Movie where the killer hides behind the tree (about 1 minute in)


Not quite what you're looking for, but still tickles me