You have found a potion from the Tavernmaster's private collection! Feel free to use it in your role-playing sessions. If you are a player, assign it to ONE of your characters. If you are a Game Master, be sure to remove the label before placing the bottle in your dungeon...
Juice of the Hummingbird (1 dose)
This is a tiny phial containing a few drops of gleaming golden fluid. When you drink this, your body is instantly suffused with a furious energy.
For 10 minutes, not only can you run at 50mph, but you must do so: any slower movement is impossible for you! You can leap 10 times further than usual and lift loads 10 times heavier. In combat you get 10 times your normal score. Unfortunately your speed of thinking is unaffected, so keep a keen eye out for obstacles!
A minor side-effect of the juice is that it heals any wounds and restores you to full health. However, next time you sleep you will be out cold for 15 hours.