"But that 75, I don't know ..." the rock legend said Monday night prior to performing at halftime of the Raiders-Falcons game at Allegiant Stadium.
Nonetheless, that was the ZZ Top founders' birthday on Monday.
The Raiders presented Gibbons with a birthday cake with a silver "75" at the top after The BFG's rocked an otherwise indifferent "Monday Night Football" crowd. Flanked by many Raiderettes, in-game announcer Sibley Scoles led a sing-along of "Happy Birthday to You."
Joined by sidemen Mike Flanigin on bass and Chris Layton on drums, Gibbons cranked out such ZZ Top hits as "She's Got Legs," "Gimme All Your Lovin'" and "Sharp Dressed Man."
As a surprise to Gibbons, the team ordered a two-tiered, silver-and-black cake decorated with a portrait of Gibbons, a half-dozen little footballs and the "75." That was the number worn by Howie Long, who was also known to rock the house.