This article says:
If there's a Holy Grail, there's a Killer Rabbit.
I can understand that to be "even if there's a good solution, there's a catch to it", but what does Killer Rabbit have to do with the Holy Grail?
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It is a reference to a Monty Python film from 1975 called Monty Python and the Holy Grail
By way of a long addendum to mplungjan's answer...
If you are going to be interacting a lot with English-speaking people, then as a point of cultural literacy, I highly suggest getting hold of this movie and watching it through at least once. This is probably not the first reference to it you have encountered, and it almost certainly won't be the last. Your typical techie can quote large sections of this film from memory, and knowledge of it is pretty much assumed. (Plus, it's f'ing hilarious)
Other MPatHG references you may stumble across include, but are not limited to: