Don't even think about...

acoustic figures (riffs is so crass for acoustic)
Not overplayed,,but what I use...

Stairway to heave
Cant Find my Way Home.
Without Love, where would you be now.. to check barre chords
Don't Know Why (norah jones covered it)
Intro to Court of the Crimson King
Can You See the Love tonight (Lion King)

if its a 12 string.. 4 or 5 supertramp tunes; Quietest Moments, School etc

some of my own stuff; No Recess, Loon and the Mist..

no idea what last 2 are..more 80s-90s stuff?

indigo girls?
and REM...i only know 1 tune from REM and that's not it ;|)

I got a big hole in my commercial musical input. Was heavy into jazz fusion listening during that period I guess.

petermac,  Funny you should mention Wish You Were Here for acoustic noodling in stores.  I always thought that would be the song I'd hear the most in stores.  Can you believe that I've actually never heard another customer playing that in a store?  Like, ever.  Only myself the very odd time.  That seems very weird to me.

I like Fender Guitars, electric and especially acoustic.

I have played all 10.

Number 2 cracks me up the most. When I first started learning to play in '77, Stairway was a big milestone. When I worked in a music store from 81-83, every person that came into the store played that song when testing a guitar - ugh.

Well, we may be showing our age, but we're also showing our great taste!! 

Ya, I don't really care for people just trying to impress others in a store.  It's so transparent.  What I do like is when someone is just honestly trying out a guitar and impressing when you know they're not aware or trying to do that.  Love seeing that.  Sincerity and heart always makes music shine.

I like to play a few songs, maybe even sing to them, just to see if the guitar will fit me for what I do most, which is just play and sing.  Admittedly, even though I play on stage, when in stores I'm kind of shy and try to wait till no one's around if I'm going to sing with the guitar.  Otherwise, I'll just noodle and try to hear the lyrics in my head. 

I have gotten a weird look here and there when I do one thing that I have not seen or heard anyone else doing and that is looking for dead notes.  lol.  I'll sit there and just pluck single notes and let them decay, one after the other, just up the chromatic scale on the 5th and 6 strings.  I'm sure some people are probably thinking, "What the heck is up with that?"  lol.