I would unironically have "what what in the butt" as my doorbell and lmao if anyone ever rang it (I don't get a lot of visitors, and if I do they don't ring the bell, so it would, at the very least, reduce some anxiety of a stranger ringing the bell as I hide and wait for them to leave 😂)
Phone ringtones from Zedge app may give you some ideas. There's loads of music snippets that have been ripped from songs that have just the right length.
My current ringtone is the famous riff from Du Hast by Rammstein.
My message notification is the bleeping from Ich Wil.
Check out Zedge or whatever the equivalent apple app would be.