Dave Grohl's Unusual Queen Keepsake

May turned up in his running gear to do some recording, changed clothes after the session and left one of his bags in Grohl's house.

The Daily Express reports that Grohl explained to Elle magazine, "That's Brian May's underpants. We hang them up there like mistletoe. Brian came down to play on the record and he shows up at the studio wearing running shorts, socks and sneakers, with two huge bags. So he puts the bags down and says, 'I'm going to change my clothes,' then comes back in these, like, MC Hammer pants, plays the lead, hangs out and then has to split.