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I think that this trope should be primarily but not completely videogames, because (by my interpretation) Hammerspace is pulling objects you really shouldn't have at all from thin air, beyond the limits of plausibility when it's not an explicit power - like Bender and Mousse - leaving no trope for when characters have an in-universe-justified Hyperspace Arsenal as an explicit power, like Homura and Erza. I suggest that the latter should either also be this trope, or YKTTW'd in its own right.
It would be nice to know which Cracked article the image is from and/or which game it is referring to.
Just wanted to add this bit of info for the Minecraft listing: If your character is carrying the max amount of dirt possible (4 rows of 9 columns each holding a stack of 64), (s)he is carrying close to 4 Million kilograms. According to this: http://wiki.answers.com/Q/How_much_does_a_cubic_meter_of_dirt_weigh a cubic meter of dirt (one block) is 1722 kilograms.
Removing the natter in the real life section. I'll put it here so if I'm being too picky it can be restored.
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How well does it match the trope?