Koalas will cut you up. Literally.
When I was about 5, I went the zoo with my family. Thing is, this zoo (Lone Pine Koala Sanctuary if you're interested), is famous for its koalas. So I go up, and we speak to the zookeeper. She gives a koala for me to cuddle. The psychopath takes one look at me and BAM! Slashes me across the face. To this day I still feel the cruel sting of a koala's sharp talons screeching on my face. I cry and we go home.
TL;DR Don't fuck with koalas
also whatever you do don't call the koalas koala bears they really dont like it