I love Irene Dunne!
There's that girl in the film 'Oklahoma' who had a very distinct laugh (as part of the script) I don't know her name but you've all got to know what I'm talking about.
Also Elizabeth Taylor's cackle/laugh in The Mirror Cracked might rival Margaret Hamilton's 'Wizard of Oz' laugh.
Was it Marion Strong, on 'I Love Lucy' whom Lucy told to "Stop cackling. I've been waiting twenty years for you to lay that egg..." ?
" ...the happiness in the tune convinces me that I'm not afraid."