Piercing the corporate veil, a simultaneously ubiquitous and arcane doctrine, has been the subject of extensive commentary and critique. While the Pennsylvania Supreme Court admitted that this is already "among the most confusing" areas of corporate law, its recent decision Mortimer v. McCool, Nos. 37 MAP 2020, 38 MAP 2020 (Pa. July 21, 2021) adds yet another layer of intricacy to this knotty enigma. With Mortimer, Pennsylvania has joined a growing number of jurisdictions that explicitly allows for the so-called enterprise theory of liability.