Please explain

Yesterday, as mentioned, I took the bus to meet Josh for a Twins game.  It requires just one transfer and drops me at Target Field's front door for the meager fee of $2.25.  It usually also comes with some bus shenanigans, which I appreciate.

I walked a few blocks from my home to the bus stop, where a hipster was sitting in the grass nearby, listening to music while he waited for the bus.  At the sidewalk extension that denotes a bus stop, I noticed two bananas and one avocado, both in pristine condition, sitting neatly next to the curb.  I frowned.  I looked at the hipster and he made 1) no mention of claiming the produce and 2) no acknowledgement of how weird this sight was.  The next step was obvious but also ran the risk of falling prey to some sort of strange prank or performance art.  I took out my camera and furtively took a photo of the scene, my dignity loosely intact.

Minutes went by, as is customary when waiting for this particular bus.  Two other passengers arrived at the bus stop.  Neither one claimed the groceries.  At the very least, this was a sad waste of an avocado, but I speculated that it may have been injected with arsenic.  I started to wonder if it was actually some sort of code meant for someone else.  My imagination began to run wild.

"If one banana is out, tonight's capers are on.  If two bananas and an avocado are out, they're off!"

Then the bus pulled up, and all four of us stepped over the produce and boarded the bus. 

When we drove past the intersection, all three pieces were gone.

Help me!!  What happened?