There is only one explanation, and This. Explains. Everything.

A play in three acts

characters:
Me - playing myself
Other People Bothering Me (OPBM)- played by themselves

Act One
Set in my small, windowless office, morning.
OPBM (walking in, interrupting an ipod-induced reverie): Can you get me an inventory of the items we discussed yesterday?
Me: I can't. It's Friday.

Act Two
Set on the patio outside the office building, midmorning.
OPBM (interrupting an intense navel-gazing exercise): Can you buy me a cheeseburger today?
Me: I can't. It's Friday.

Act Three
Set in the lobby. Midafternoon.
Me: (walks by OPBM while yawning)
OPBM: Stop yawning!
Me: I can't. It's Friday.

Scene.