An interesting canvas...
I keep my car parked in the (tiny) driveway of my roomie's house. Yesterday morning, I awoke to find my car encased in a lovely layer of ice. I luckily have a rear windshield defroster, and I scraped enough of the front windshield with my gloved hand to enable me to drive to the stop 'n' rob to get my morning decaf coffee.
Today, as I was driving away from my veterinarian, I glanced in the rearview mirror and noticed some writing in the dusty residue on my rear windshield. Some witty person had written GLOBAL WARMING, MY ASS!!!! on it at some point during yesterday's icy morning.
I larfed and larfed!