shrill, maniacal laughter
I was under the impression that 'shrill' meant high pitched. Quite the opposite of a rumble and perhaps more related to a 'frenzy'. God I wish Hasbro would buy a dictionary and use it for these things.

As for Deep Dive. Blech colours. I am not sure if it's my eyes playing tricks on me, but I think I see the slight forming of an Autobot symbol in his rub-sign.