This may be old stuff to those of you in wetter climates but something easily overlooked in dry AZ.
I'm furring out a bathroom wall before installing a vanity I built.
I was trimming some 2 X 6's to length on the chop saw and since they were ten footers and I don't have a support that long I pressed the Unisaw into service to support the long end. A handy cutoff of pressure treated lumber on top of the fence was just the right height.
I finished my cuts, hauled the lumber into the bathroom and called it a day. Unfortunately, the next day when I hit the shop I discovered that I had knocked the block of PT onto the saw tabletop and underneath was a (not so) nice rust spot.