1000 Word Adventures
1000 Word Adventures are a system agnostic line of adventures that give the GM enough ideas to run a short adventure on the fly.  Just add dice and players.
 
No prep, no fuss, no problem.  
 
1KWA1 - The Coin Purse's Strings by Brian Berg
In the town of Reyston, criminals have been shaving coins for illicit profits.  When the players are found unbeknownst with shaven coins, they are arrested and tried for attempting to pass off the illegal coins.  The town constable hears their pleas, but requires they serve some restitution--in the form of hunting down those responsible for the coin shaving operation in this fun urban adventure.