When the Off-Broadway comedy, Things You Shouldn't Say Past Midnight, celebrates its 100th performance July 18, members of the audience who purchased full-price tickets will receive free show tee shirts. Midnight began previews at the Promenade Theatre April 23, opening May 13.

Erin Dilly and Clea Lewis star in the Peter Ackerman farce. Dilly recently appeared in the Encores! production of Babes in Arms. Lewis, meanwhile, is best known for her portrayal of Audrey in the sitcom "Ellen."

Also in the cast are Andrew Benator, Jeffrey Donovan, Nicholas Kepros and Mark Kassen. John Rando directs. Jeffrey Richards, Ted Snowden, Jean Doumanian, Soloway/Levy and Good Friends/Michael Rothfeld are the producers.

Peter Ackerman's comedy followed James Naughton: Street of Dreams into Off-Broadway's Promenade on the Upper West Side. The work is described as having "six characters, three beds, a party line telephone, twists, surprises, pillows, mattresses and laughter." When a couple (Dilly and Kassen) find their coitus interrupted by a 3 AM squabble over three little words -- and they're not "I love you" -- she runs to her best friend (Lewis), who in turn is having her own situation: a fling with a dangerous doofus (Donovan) who wants to be more than just her "boytoy."

Things is Ackerman's first play. The author, 28, previous worked in another branch of the theatre -- as an understudy in the Off-Broadway play Visiting Mr. Green. Another Ackerman comedy, Urn, also recently started performances in Manhattan. The busy director Rando is known for his work on David Ives' plays such as Mere Mortals and Lives of the Saints. He also mounted Do Re Mi at City Center for the Encores! series and is currently represented in Los Angeles by a revival of Merton of the Movies at the Geffen Playhouse.

For information, call (212) 947-8844 or (212) 580-1313.

-- By Christine Ehren and Robert Simonson