During the first half of the show, it seems a woman – under the influence of alcohol – began hurling the fruit at the cast.
After being asked to stop by front of house staff, the unrest escalated – according to WhatsOnStage.
She was swiftly ejected while the show was momentarily halted.
Performer Jodie Jacobs tweeted afterwards: “SHOUT OUT to the woman who got bungalowed at @BananamanShow and began throwing ACTUAL EARTHLY BANANAS at the cast!!
“She had her party poppers confiscated too! One for the autobiography!”
Co-star Emma Ralston posted: “It’s true. Tonight a drunk lady in the Bananaman audience threw 2 bananas at cast members. A theatrical first. WOW.”
Alex David Vass wrote on his own page: “And the award for most awful audience member I’ve ever witnessed goes to the woman tonight in the front row of Bananaman at @swkplay who, additional to talking continuously, threw a banana at a cast member not once but two times.
“How does ANYONE deem that acceptable in a theatre?”
Another performer joked that the intruder could have been given a cameo, saying: “It was funny for 2 seconds but seriously….what did she think she was doing?!
“Had she come to rehearsals we could have given her a cameo!”
Bananaman plays until January 20.