Layla and I found this on one of the garage walls when we first moved in. It's sortof difficult to see (you'll likely have to click the picture to really make it out—don't worry, I've sized it down a bit so it isn't huuuuge) which is probably why we didn't see it when we walked through the place on Friday.
It looks like it's in sharpie—and it's absolutely awesome.
I cant make out the top line
MOTOR
HARLEY-DAVIDSON
CYCLES
As far as I can, err, tell.
Look for nail or thumtack holes near the top corners. I've got a feeling someone was making a flag/banner type thing and put cloth on the wall and then drew on it.