I pulled up behind this vehicle at a stoplight on my way home tonight.
I noticed the sticker. I assume it means that the driver is angry. He's angry that people are driving so badly while they talk on their mobile phones. So angry he had to buy a sticker that expressed that to everyone.
He is so angry about phoning and driving that he wants to shove all these phones where the sun don't shine.
Then I looked at the driver and noticed he is talking on a mobile phone. And swerving.