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If you're not lead singer Marcus Mumford, simply saying "I'm one of the Sons" doesn't fly over well with security.

That's sort of what happened to Winston Marshall, Mumford & Sons' banjo player, after the BRIT Awards last week. The quartet, who appeared elated after winning Best British Group in our interview, headed to their Universal Records afterparty in London's East End. That is when Marshall was denied entry, NME reports.

Marshall was left standing in the cold asking attendees if they had an extra ticket. What we'd like to know is where were the rest of his bandmates? They should have all walked in together to avoid any issues. Marshall eventually found a way into the party (the same party that had DJ Taylor Swift on decks).

Click here to see their performance at the BRIT Awards.