Lindsay from Pittsburgh (CC BY 2.0)

After a while you learn to expect the unexpected from the Foo Fighters, but even this one threw us for a loop.

The indomitable ‘Good Guy Grohl’ invited a “crying grown man” on stage at Fiddler’s Green Amphitheater in Colorado to sing with him last night (August 16).

The band was playing an acoustic rendition of “My Hero” when Grohl asked for the house lights to be turned on so he can get a better look at the audience. Half way through the song, he noticed a drunk man who had been brought to tears by the song.

“Don’t cry motherf****r. I know you’re drunk, don’t cry.

Are you crying right now? You’re f**king crying aren’t you? I love you man! Look at you, holy s**t. You know what, f**k that speech I was just going to make. I’m singing this s**t to you right now.

I’m gonna sing this f**king song right in your face, man to man, prison style, I’m going man to man. Me and you, I want some real tears, you better sing it with me. Don’t make me cry, because I promised I wouldn’t do this.

Get closer, get front row. Where are you going motherf**ker? Get back here! No you get here, front row. I’m going to sing this to your crying grown man ass right now. Front row, against the rail, right here, get in here motherf**er, you drunk emotional mess!

Despite these clear instructions, the man somehow managed to stumble around the front row and onto the stage, where the Foo Fighters front man delivered on his promise and sang right in front of the fan (called Anthony)’s face. He even shared the mic with him for a duet on the chorus.

Good Guy Grohl strikes again.