“Liar” has a clunky first act, and two actresses get handed the same stereotype: Amanda Donohoe plays Boss Slut, and Jennifer Tilly plays Client Slut. (Fletcher’s ex, not a slut, is played warmly by Maura Tierney.) But once Fletcher starts telling the truth against his will, the movie delivers some perfect laughs. Fletcher maniacally abuses his firm’s partners and literally beats himself up in a john. For 80 minutes, this is the best volcano movie of the year.

But Carrey, a true subversive, shouldn’t be wasting his time rattling the bars of ordinary, Michael Keaton-y scripts like this one. When Fletcher inevitably becomes caring and chants “I love my son,” you cringe. Would Ace Ventura deliver lines like these? Sure-from his famous talking backside.