When a theater or concert performance begins, there is often an announcement asking audience members to silence their cell phones and similar devices. Some time ago, a light blinked near the ear of a gentleman a few rows in front of me throughout the entire performance. I couldn't tell what it was for sure, but it appeared to be the indicator light of a Bluetooth headset.

Blink.

Five seconds later:

Blink.

Five seconds later:

Blink.

Repeat for two hours.

What I want to know is, was this guy expecting a call during the show? If his phone rang, would he answer it from his seat?

(Added: This was before Bluetooth headsets were in common use. It wasn't until after the show that I was able to guess what it was.)