Damn, where did I see that guy...?

Today, I went out and eat lunch w/ w.k.w in Quarrybay (around my office la). And on the way back, I saw someone on the street. So familiar!!!! but i just can't remember who he is. Did u ever had that experience? He obviously not working in my office, and he didn't work in Cathay also... Could he work w/ HIAS? or Jardin...? Cos I so recongized him. but then i can't see him in either uniforms, so i kept thinking all afternoon. Now suddenly i remember where I saw him la! He was in a Karaoke tournament that I went w/w.k.w abt a year ago! hahaha. and he sings just like Leo Koo. Very good!