He spoke to our moms!

While my friend and I were hanging out elsewhere before a Foo Fighters concert, our moms (also friends) were in the downtown area near where the arena was. It turns out our moms ran into Dave Grohl, who was walking around trying to find a nearby tattoo place, and my friend's mom recognised him. Apparently there was a relatively long conversation about Dave's mother, tattoos, and the town (as an offshoot of getting tattoo parlor directions). And then neither mom remembered to get an autograph or anything. At the concert though, he announced my friend's name and said 'Your mom says hi, she's really nice'. My friend was very excited, and extremely confused. However the fact that he spoke at length with our moms in a normal conversation just ensured we would like him forever, being nice enough to tolerate our moms.