How About a 20,000mg THC Pot Brownie for National Brownie Day? (Yes, It’s Real!) By JasonDecember 9, 2021aggregated Who doesn’t love a space cake on National Brownie Day, but be careful, MeriMed in Norwood, MA may have created the monster of all pot brownies? Weighing in at a beastly 850 lbs., this massive hunk of chocolate mix has 20,000mgs of THC.