You reach inside an pull out a snapped wand. It wasn't anything impressive, just a stick almost broken in two. You decided to put it back, but were stopped by an old man calling to you.
"You've taken it, now you have to buy it." He had a creepy smile on his face as he held out a hand for the money.
You grumble about bullshit rules and you put a few notes into the man's hand. You might be able to find a use for this stick, but you weren't hopeful. The man's smile widens further, and gets a lot creepier.
"Be careful with this wand. Although it is very powerful, its damage means that there is a random effect each time you use it. Have fun!"
The world seems to spin for a moment, and you find yourself back home, holding a broken stick and missing $20.