Nifty trick for squeezing lemons to get all the juice out.
Trick for Squeezing Lemons – Martha Stewart Food.
Admittedly, I haven’t tried it, and it seems like something that could quickly get messy unless you’re doing it as pictured or over a larger bowl.
But it could be practical for when the recipe calls for the unspecified “juice of x lemons” instead of tablespoons or milliliters. I’d probably do it over a sieve to catch the stones, though.