Last summer when T. and I went out to my parents' place in Washington State for the cherries (and to, you know, visit) I had some slick little Oxo cherry pitters shipped there a week in advance. Hey, I was excited. We don't get many cherries—much less sour cherries—down here in the GA.
I shouldn't have bothered, though, because we determined, through the highly scientific experiment known as a "race," that the paperclip does a much, much faster job. Also a better one, because it makes only one hole in the cherry rather than two, so the cherry stays nice and intact and plump—this is what you want if you're making brandied cherries or sour-cherry preserves, or freezing a quart bag of sweet cherries for a winter clafouti.
First get yourself a large paperclip and unfold it once, like the one in the picture above.
Pull off the cherry stem:
Hold the cherry firmly in one hand and jam the small fold of the paperclip into the cherry where the stem was, angling it a bit so it slides right along one side of the pit:
You'll be able to feel when the bend in the clip has reached the end of the pit. Now lever the pit and sort of pull it out the hole you just made. You might need to apply a little pressure with the fingers holding the cherry. (It's easier than it sounds.)
Cherry, one hole, no pit:
This was about four pounds of Bing cherries, and it took maybe ten minutes. So raid the supply closet at the office and pit some cherries this weekend!