How to impress a Client

I was in the airport VIP lounge en route to Seattle a couple of weeks ago. While in there, I noticed Bill Gates sitting comfortably in the corner, enjoying a drink. I was meeting a very important client who was also flying to Seattle, but she was running a little bit late.
Well, being a straightforward kind of guy, I approached the Microsoft chairman, introduced myself, and said, "Mr. Gates, I wonder if you would do me a favor."
"Yes?"
"I'm sitting right over there," pointing to my seat at the bar, "and I'm waiting for a very important client. Would you be so kind when she arrives as to come walk by and just say "Hi Tom?"
"Sure."
I shook his hand and thanked him and went back to my seat. About ten minutes later, my client showed up. We ordered a drink and started to talk business. A couple of minutes later, I felt a tap on my shoulder. It Was Bill Gates.
"Hi, Tom," he said.
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I replied, "Shut up, Bill, I'm in a meeting!"