Crocs are a fine choice of footwear when, um. Ah. Lets see, when you need to, hmmm...
No, fuck it - Crocs are never to be worn EVER.
Even if it means walking across the most prickle-filled back yard in the history of back yards, you should never ever put these abominations on your feet.
Case in point;
What a load of shit.
(Thanks to D Listed for the pic)