You're looking to buy a guitar. You pick it up to take it for a test drive. What do you play? How long do you play? What are you looking for? What tells you to go ahead and buy it? (Price considerations aside.) Curious what others do. ETA - I should have been more specific. By way of example. I've been shopping for a telecaster and there are many things to consider, but I noticed that without really thinking about it or making a conscious decision I always include the intro to Johnny B Goode, Listen to Her Heart by Tom Petty, and the solo from Kid by the Pretenders. Then I do some jazz chords in the middle of the neck. I don't always play the exact same things, but I do always play those things. I don't know exactly why.