As just about anyone can tell you, Alex Honnold doesn't always use protection. In fact, not using protection is kind of his thing. However, when he's feeling cautious while climbing heinously-wide chimneys and/or off-width cracks, there's only one tool for the job: Black Diamond's Camalot C4 #21.
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While this is obviously an April Fools joke, it seems that at least two of these monsters were actually built and dragged up a route in the Southwest. Imagine rolling up to the spot and seeing someone with a #21 on their rack...
It might not fit in your bag, unfortunately. Black Diamond photo.
As many web-browsing climbers have already commented, it's not hard to come up with other uses for such a large cam. You could use it as a car jack, chandelier, boat anchor, or chimney blocking Santa-deterrent.