Rock band Say Anything made a prediction at the start of their sold out show Tuesday at Black Cat.

Frontman Max Bemis believed the crowd and band would to have a lot of fun that night and, on cue, the audience responded with cheers, outstretched hands and shouts of excited agreement. The enthusiasm didn’t wane  during the band’s mix of both new and familiar music.

The crowd remained mostly still and silent throughout the openers Tallhart, Fake Problems and Kevin Devine and The Goddamn Band but as Say Anything stepped on the gated-off upstairs stage the energy exploded.

Halfway through their nearly two-hour set, after playing “Hate Everyone” from 2009 and “Wow, I Can Get Sexual Too” from 2006, Bemis introduced a special surprise guest – his wife, Sherri DuPree, the lead singer of the band Eisley.

Dressed in a sleeveless Misfits T-shirt, plaid skirt and short pink-tinted hair, she performed “So Good” with the band, a love song from Say Anything’s newest album “Anarchy, My Dear.”

The romantic lyrics, including the repeated lines “you look so good tonight, I gotta have you,” are atypical of the band’s usually harder, angrier lyrics.

Inciting the crowd’s sustained high-energy enthusiasm throughout the show with flailing gestures, a swinging mic and even performing a few dance moves, Bemis returned the appreciative favor, calling the D.C. audience one of the best he has met on tour.