Inside a crate on level 1, you find
A black t-shirt with "EAT ME!" printed in a wacky red 90's style pop-font. There are a few holes in arching patterns.
Any animal that witnesses someone wearing this shirt, will be instantly overcome with a ravenous hunger and desperate need to consume its wearer. Unfortunately, humans are animals as well, and as such, anyone with an IQ less than 80 is also affected.