The Vortigern Forgery

Smithsonian magazine has an interesting article in its June issue about William-Henry Ireland, a deadbeat clerk who, in 1795, forged a variety of Shakespeare-related documents, including deeds, poems and an entirely new play, all in an attempt to impress his Bardophile father. The forgeries fooled even James Boswell, and the play was eventually performed -- though not to much critical acclaim. Check out the article and then answer me this: If you could claim authorship of one Shakespeare play, which one would you choose?