It must get lonely guarding the gates to hell all day, only having your other head to talk to. I don't really blame Cerberus for messing with me when I try to get in, she must be bored out of her mind...
I gotta get into hell, even if I have to put up with this giant dog's antics...
(Yes, I know Cerberus is male, if you want to be accurate just change the gender.)