Why I love the UNDO button

So I was working on three contracts this afternoon, and I accidentally overwrote a LOT of information that I didn't notice, until about a half hour later! Luckily, MS Word saved by butt, because MS Word saves up to 100 UNDOs at a time. But for some reason in this instance I got to go back 184 UNDOs! Whatever it was...rockOn!