Don Henley, Warren Beatty, Gary & Jake Busey, Shirley McClain, John Cusack, Neve Campbell, Richard Dean Anderson, Zack De La Rocha (not in concert, btw), Tony Danza (he still owes me $7.50), D.B. Sweeny, Nikki Six & Donna Diericho, Terrence Trent D'Arby, Tia & Tamara Mowry, Jane Seymore, Pierce Brosnan, Dana Carvey, Kevin Nieland... that's all I can recall off-hand.
Most of those I helped at either a gas station or coffee shop (or both) in Malibu.
-Garth