I commute from Encinitas to San Diego and was half way to the Coaster train station when I realized I left my iPhone at home.
I debated for a single moment, but thought no way do I want to ride the train, both ways, without music/podcasts to listen to.
I turned around, went home and picked it up only to return and miss my train by a couple of minutes.
The next one was 33 minutes later, but I'd do it again. It was worth making the trip back home for.
The only thing worse was about six months ago not forgetting the iPhone but instead the headphones!
Staring at my iPhone on that train ride but not able to really use it was sad.
(On my lunch hour I picked up a cheap pair of earbuds from a local grocery store as a back-up.)