An interesting set of gadget tropes to pick; I suppose they pruned the list for those that were scientifically testable as opposed to "freeze rays" and such.
I think that the Batman-style grapnel/ascender rig is probably /possible/... just not quite as small as the cartoon makes it out to be, and probably hellaciously expensive. The actual componentry and machining would be far beyond what the Mythbusters could spend a few days on, but then, we're talking Bruce Wayne's Billions, here. And they did prove that the ascender itself was doable, and could lift a man at a reasonable speed.--
"I give you the beautiful... the talented... the tirelessly atomic-powered...
R!
DOROTHY!
WAYNERIGHT!
--
Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.
I think that the Batman-style grapnel/ascender rig is probably /possible/... just not quite as small as the cartoon makes it out to be, and probably hellaciously expensive. The actual componentry and machining would be far beyond what the Mythbusters could spend a few days on, but then, we're talking Bruce Wayne's Billions, here. And they did prove that the ascender itself was doable, and could lift a man at a reasonable speed.--
"I give you the beautiful... the talented... the tirelessly atomic-powered...
R!
DOROTHY!
WAYNERIGHT!
--
Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.