Is this cricket's greatest ever catch that wasn't?

Brendon McCullum has pulled off an incredible diving boundary catch while playing for Gujarat Lions in the IPL.

There was just one problem - it didn't count.

Fielding in the deep against Delhi Daredevils, the Kiwi master blaster dived full stretch for a sensational grab, but released it straight away seconds before falling over the boundary.

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While not a catch, it certainly was a brilliant bit of fielding, turning a six into just two runs.

It got us thinking about the greatest ever catches that weren't. How does McCullum's effort stack up against these: