Every now and again the floor quivers slightly.
It's because Broad Ripple's famous singing tree hippie is up with his chain saw taking chunks off the top of the dead silver maple out front and they plummet to the earth below with a ground-shaking *THUD!*
I pretend it's because the Boche are shelling the lines near our bunker. ta-pocketa-pocketa-pocketa-pocketa-pocketa.