coffee service

This is actually a post from last month on my other blog that I forgot to post here.

"Can I have a coffee?" I ask while signaling the server with my hand.
"how many sugar packets?" the server responds.
I close my fist leaving the index finger out to signal that I would like one packet.
As the server turns I realize my error. The server brings the coffee and there are two sugar packets on the saucer. I tell him he can take one back and he apologises saying that he though that I had told him I wanted two. I had only raised one finger but I had raised the wrong one. If I only wanted one sugar I should have put out my thumb. The index finger should only be extended, to accompany the thumb, should I want two.