Panel 4 reminds me of the foot operated door pulls the management of my previous work place installed on all the bathroom doors during the big swine flu scare. I used those all the time. Not because of the worry of germs mind you, but because of how few of my coworkers bothered to wash their hands after answering the call of nature.
Come to think of it, that place is also one of the reasons I started carrying packages of moist towelettes with me. Bad for the environment, but sometimes you just NEED to clean your hands.