I heard that if you take your yeast out of the fridge or freezer and plop it into something 30-40 deg warmer, it can actually KILL some of the cells through shock.
Not true. As long as you're pitching colder yeast into warmer wort, it's actually beneficial. Once the yeast start warming up, they start consuming their glycon reserves. You want that to happen in the wort, not before the yeast reaches the wort. I've been taking yeast, both dry and liquid, out of the fridge just minutes before pitching for years and hundreds of batches. It works great.