Film locations galore

A mere stroll from us is John Marshall High School, used in such films as Buffy the Vampire Slayer, Grosse Pointe Blank, A Nightmare on Elm Street, and Raiders of the Lost Ark. The football field was used for the final scenes of Grease ('You're the One That I Want'...)

The school is also named after the US's greatest Chief Justice, who in 1832 (1832!!) recognised the Indian tribes as sovereign nations (Worcester v Georgia).

"No worries"

When we first moved to Los Feliz, I was sitting in the Coffee Bean one day and a fellow customer asked if she could take the spare chair at my table. I said, "No worries," and she took it but then turned back:

"Are you Australian?"

"Was it the accent?" I asked.

"No, it was 'no worries'," she said.

Since then, in the last six months, I've heard Americans saying "no worries" several times. Is this how phrases catch on? Should I start saying, "No sweat" and see what happens?