It's rude to stare at people you find unattractive.
Ron sees a relatively ugly person eating at the table across from him.
Ron wants to get a better look at them.
Ron takes quick glances to get a look at this curious looking person, looking away quick too.
Ron just can't stop looking at the table across, looking directly at them.
The stranger never realizes, and Ron gets to complete his looking.
Ron makes the stranger feel very uncomfortable and the stranger eventually leaves.