Brian Cox has a semi-secret side hustle — as the voice of McDonald’s. In fact, the distinctive-sounding Scottish actor has another voiceover gig with the Golden Arches this week, now that he has some time to spare — the hit HBO comedy-drama series drew to a close in May with its fourth season. Cox, who can be heard on television singing the famous “Ba da ba ba ba” jingle, told People he actually sings “all the time,” and would love to give his pipes more of a workout professionally.