Next time you’re getting your blood work done for a yearly physical, check to see if they’re asking for urine as well. If so, do me a favor.
Give your urine, of course. Hell, they’re the only people out there asking you for it so it’s the least you can do.
But, when you’re done, walk back out to the nurse or technician or starving actor who requested your juice and ask them for another cup/vial/tub. They’ll be perplexed; they’ll probably think you made a mistake. So, when they ask you why, just look at them with the most innocent face you can muster and, with a great deal of enthusiasm, be sure to exclaim, “I got more!”