I've seen flight passengers do a lot of WILD things during flights but this is definitely one of the grossest things I've seen someone do on a plane.
A bold passenger was caught on camera drying his training shoes by using the air vent during the flight.
The passenger raised the shoe up to the vent in plain view of everyone. The video was posted on the Passenger Shaming Instagram account.
The comments from the IG post range from "What is wrong with people" to "revolting" to "If I catch someone doing this, I'm punching."