Drunk on Mitzvos

Those who study the daf will notice that the last word of Friday’s daf (Bava Metzia 23b) can be translated as “bed” or “Purim.” Rashi translates it as bed. The Maharsha says it means Purim. We trust a scholar to identify a lost object as belonging to him even without any identifying mark as long as he is established as being scrupulously honest. The Gemara states that the definition of a scrupulously honest scholar is that he only lies about three things. He lies about the identification of his host to ensure that his host isn’t overrun with hundreds of people seeking lodging. He humbly says he didn’t learn a certain mesechta when he really did. He also lies about “puraya.” The Maharsha says that a scholar will lie and say he is drunk on Purim even when he isn’t.
Why is the scholar lying about this? Moreover, if there is a mitzvah to get drunk on Purim, why isn’t the scholar getting drunk?
A few explanations of the Maharsha have been offered. The simplest explanation is that the scholar isn’t feeling well enough to drink on Purim. However, he is embarrassed that he isn’t fulfilling the mitzvah properly for reasons beyond his control. Alternatively, he doesn’t want people to conclude that there is no mitzvah to drink on Purim. Therefore, he lies and says he is drunk. This way, he won’t be embarrassed, and people will not get the wrong impression.