That's my mystery girl Underneath the window Walkin in the sidewalk Swingin' in the sunshine Lookin' like a dream - one day (One day) I'm gonna say (I'm gonna say) "Hello" ("Hello") ("Hello") Sometimes your life seems lonely Sometimes your life's a bore I never let it beat me I got a treat in store When I feel lonesome I gaze on down the street For she comes walkin', And she looks mighty sweet and thats my mystery girl Underneath the window Walkin in the sidewalk Swingin' in the sunshine Lookin' like a dream - one day (One day) I'm gonna say (I'm gonna say) "Hello" ("Hello") ("Hello") Lookin' like a dream - one day (One day) I'm gonna say (I'm gonna say) "Hello" ("Hello") ("Hello") Sometimes your life's a trouble Sometimes might take a spill I never let it beat me I got a secret thrill The boys say, " thats nice ", She causes quite a stir I tell them " Hmm - no dice ", Just keep your eyes off her, cos That's my myster girl Underneath the window Walkin in the sidewalk Swingin' in the sunshine Lookin' like a dream - one day (One day) I'm gonna say (I'm gonna say) "Hello" ("Hello") ("Hello") One day (One day) I'm gonna say (I'm gonna say) "Hello" ("Hello") ("Hello") One day (One day) I'm gonna say (I'm gonna say) "Hello" ("Hello")