In the early years of Foo Fighters career they would open for Mike Watt and his band The Minutemen and Dave Grohl and Pat Smear would join Mike on occasion on stage and they would jam. Now after nearly 17 years later, they all decided to do the same thing to surprise Watt's recent Seattle audience. With his band, The Missingmen, Watt brought out Grohl and Smear along with Pearl Jam's Eddie Vedder to perform "Big Train." Take a look!