Protecting Sir Paul McCartney is no laughing matter -- and last night his bodyguard threatened to open a major can of whoopass on photogs ... in the form of a stun gun.
The altercation went down right after Sir Paul and Dave Grohl were wrapping up a double date for dinner at Crossroads restaurant.
McCartney was stepping into his chauffeur driven ride ... and the bodyguard clearly thought the paparazzi were getting a little too close, 'cause he barked out ... "Don't make me use my stun gun!"
Watch the vid ... the bodyguard may have overreacted -- but he sounds like he means it.
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