My cat is a menace

I have this hairless cat named Gizmo (technically he's my sisters) who is literally the most batshit crazy cat I have ever met.

I will just be walking past the couch and this little freak with scale up my whole fucking torso to plop himself on my shoulder without ANY warning

He's like actually crazy. He also eats dog food which keeps getting him sick but he just. wont. stop.