It turns out that a key lime is just small enough to fit into a Zyliss Jumbo-size garlic press. Using a garlic press, a key lime can be used for a quick glass of limeade.
Step 1: This is all you need
You'll also want a glass, some ice and water or seltzer.
Step 2: Cut the lime to fit the garlic press
Step 3: S q u e e z e !
You will get some of the oil from the lime's skin. Too much of this will make the limeade bitter.