Only sort of? In what way could it not be a joke? Personally, caffeine is already near the upper limit in side effects I'm willing to tolerate (trembling and nervousness if I drink too much), and I don't think I'd be willing to experiment with meth even if it were safe and legal. I did try modafinil once, many years ago, and was astounded at how well it replicated all the beneficial effects of caffeine without the side effects (and had a concentration boost as well, which is actually the opposite of caffeine effects for me), but for financial reasons I didn't pursue getting a prescription at that time.