Jukebox musicals are exactly the kind of shows that pull in the second. On a recent Friday night, body cameras were visible on the security guards at the Aldwych Theater for “Tina: The Tina Turner Musical.” A preshow announcement asked people to “please refrain” from dancing or singing during the performance, and, in the first half, ushers had to tell at least three audience members in the orchestra level to put their phones away and stop filming.

But there was nothing bad enough to warrant a body camera’s glare. No one was sick in the aisle, and no one belted out “Let’s Stay Together” from their seat. At one point in the second half, a minor flap broke out when a woman spilled a glass of rosé and lemonade. But any noise was just the woman, in a very British fashion, repeatedly apologizing for the upset.

After the performance, a bachelorette party stood outside the theater taking photos. Emma Simpson, 46, wearing a veil and “Bride to Be” sash, said her party, who were wearing novelty headgear for the night, had been well behaved. “We only had two gin and tonics before the show,” she said.

Body cameras sounded like a brilliant idea, Ms. Simpson added. “I’m all for people having a little bit of a laugh, but it’s a thin line when you’re spoiling it for others,” she said. Her group had gone out of its way not to be a pain, she said: “We even took our bunny ears off.”