John Mayer Has an Idea for Knowing When to Put on Deodorant

John Mayer checks his phone messages while shopping at Cartier on Madison Avenue on Saturday afternoon (September 27) in New York City.

The 36-year-old musician was nice enough to stop and take some photos with fans.

The day before, John kept a low profile as he carried a leather bag while checking into The Carlyle Hotel on Manhattan’s Upper East Side.

“An indicator cap on deodorant that tells you if you already put it or not,” he recently tweeted.

WHAT DO YOU THINK of John Mayer’s deodorant invention idea?