The singer gave a couple who had bought tickets to see her play London's Hammersmith Apollo on Tuesday night to celebrate their anniversary free tickets to get into the venue after they discovered the ones they had were fake.
During her set she asked where the couple were in the audience before wishing them a happy anniversary.
Adele then told the crowd: "Did any of your friends get scammed? Tell them I'm sorry, but there's nothing I can do."
She added: "I'm going to dedicate this next song to those people who couldn't get in," before playing her 21 album track 'Turning Tables'.
Towards the end of her intimate set, the star told the audience: "This is the last time you'll catch me at a venue like this. These will be my last theatre dates as I'm moving on to arenas. I'll be at the O2 in February."
After receiving jeers and boos from the crowd, Adele laughed: "Too many people want to see my shows, I have to. Don't worry, I'll still get into the crowd and everything."
During her final song 'Rolling In The Deep', the songstress stopped the performance as she noticed someone had fainted in the crowd, following a similar situation at her show the night before.
"Medic. Can someone help that person? I can't believe this. It's happened again. How rock 'n' roll," she said.
Adele will play her third London show at the Royal Albert Hall on September 22.
> Adele's 21 album on course to sell 13 million copies by Christmas
Watch Adele perform 'Turning Tables' live below: