Spell check?

Yesterday I walked over to the supply room at work to pick up a wite-out contraption and it turns out I got the last one.  The rule is that if you take the last one you write it on the supply order list.  I quickly scanned the list and discovered someone had already written it in, and then I noticed this:

SISORRS?!?!?!?!?!

I thought that was pretty funny!