Even the CD is funny!
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I love Spinal Tap and their cleverness always impresses me. If you look at the CD, it's designed to appear as if the LP was "misprinted" as it doesn't align with the CD hole. Such a hilarious and unique detail.
source: http://mla-s1-p.mlstatic.com
source: http://mla-s1-p.mlstatic.com