It isn't strictly perl, but it comes up doing graphics programming. When I need to remember the coordinate order for a box, I use "terrible" and "later babe" to remember whether the elements go in "top, right, bottom, left" or "left, top, right, bottom" order.
For example, CSS is terrible when you specify borders and margins:
margin: 1em 2em 3em 4em;
// is equivalent to:
margin-top: 1em;
margin-right: 2em;
margin-bottom: 3em;
margin-left: 4em;
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