My not-yet-2 year old son bought a Lost episode, because the damn thing was on a "forced selection" design:
Lost was the very first auto-selection on startup, and each A button push advances you to buy the first episode, and doesn't require any other button to be pushed.
Heck, if a controller was malfunctioning, or had a weight on top of it it could easily happen.
Xbox support didn't give a crap, or even see the bind they are putting consumers in when they program the interface to auto-select the options that lead to accidental purchases.
I believe they deliberately design the interface to do this, and then stand behind their cowardly "no refunds" policy.