Bob Weir Joins Paul McCartney at Fenway Gig [VIDEO]

Paul McCartney has special guest on stage over the weekend at Fenway Park.

Maybe Bob just never left the park? After all, Dead & Company took over Fenway the previous weekend. Bob hopped on stage with Sir Paul for "Hi! Hi! Hi!" Although we can't tell if he was really playing.

Later that night Gronk got his air guitar of with Paul on stage. We're thankful he didn't try to Gronk Spike the 74 year-old Wings rocker.