Relative Timeliness

Clifford, at Cosmic Variance discusses his hope "to have science education and awareness so much the norm that everybody will casually - and without apology - sprinkle science facts, science reasoning and science humour into their everyday conversations just like they would sport, politics, or popular culture."

Here's my observation:

Time runs faster for the person who has to run to the store for a couple of six packs when the beer runs out ("the store's like three minutes from here! it'll only take a sec'!") than the people back at the party waiting for him to deliver said beer ("how long has he been gone?").

I'm not sure if this is because the people at the party are stationary, compared to the the person sent to get beer, or if there are non-relativistic explanations.