Alacrity

Good things to know-- Tricks of the Trade
A list of hints from a wide variety of trades, including...

Software Tester
Because developers don’t expect testers to read through their code, doing so is a quick and easy way to find possible bugs. Look for comments like “// HACK” or “// fix this crap later.”

Cartographer
Mapmakers will often use “copyright traps,” bits of information in their maps that are purposefully wrong. They might label a body of water “Lake Strongbad,” for instance, and then examine the next editions of competitors’ maps to see if the incorrect information makes an appearance.

Botanist
...And when doing botanical work in South America, steer clear of the monkeys: They will throw sticks at you with surprising accuracy.

(link courtesy of MetaFilter)