I think it's not the only German verb that has irregular forms for intransitive and regular forms for transitive.
There's some strange irony in it - if I do some sh.t to someone else it's the right thing (transitive, regular verb), if they do the same sh.t to me, it's the wrong thing (intransitive, irregular verb).
I got scared of you (Dat., intransitive) - it's a bad thing (Ich bin erschrocken vor dir)
I scared you (Akk, transitive) - it's totally fine (ich erschrak dich)
Sorry I'm an idiot and my examples are almost always totally idiotic. :)