How do you annoy a guitarist?

A guy I used to work with had been a lead guitarist for a well known rock group in the 70's. He used to tell the following story: One day he was playing at a recording studio and Ry Cooder (a legendary guitarist) walked in.

Ry Cooder listened to his playing, and when the track was over came and asked "Can I have a look at your guitar?"

My friend of course was inordinately flattered that the great Ry Cooder wanted to check out his guitar, so he handed it over.

Ry Cooder played a few notes thoughtfully, handed it back and said "No, it wasn't the guitar..."

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