Not only was Crazy Little Thing Called Love their FIRST US #1 hit (despite coming out after Bohemian Rhapsody, We Will Rock You, and Killer Queen), it held the spot even longer than Another One Bites the Dust.
Maybe the trick to this question was you had to be a 12-year-old in 1979 who spent a lot of time in cars with the radio on.
Like Savoir Faire, CRAZY LITTLE THING CALLED LOVE was *everywhere*