Creative Writing Challenge

Walking home last night, I noticed something strange: a bike chained to a fence. "Huh?" you say, "That's not odd. Why are you bothering me with this story?" Because it was a stationary bike. Like, what? Ummmm . . . someone rode up on their stationary bike, chained it to the fence, and ran inside for a moment? This must be a fine specimen of a person. Imagine how robustly you'd have to pedal to make forward progress on an exercise bike. This clearly is an all brawn no brains person.
from jkatj's journal

Okay, I challenge you all to write stories explaining to me how that bike really got there.