Let's pull out the old soap box.
I tend to judge people on campus who put in their headphones
the minute they exit a building,
then take them out 3 minutes later
when they reach their next class.
To me it says,
"You're not interesting enough to live inside your own head for 5 minutes
without music to distract you."
Do you have a personality?
Disclaimer: I do it sometimes when I'm walking to the grocery store.