The caffeine curve

Terri sent me this today, not sure what the original source is. Lots of google hits, looks like its been around for a while.
As she put it,
Only if it is GOOD coffee. Otherwise you go from first cup to triple shotgun murder in …. one cup.
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October 17th, 2008 at 5:41 am
Thanks for posting my graphic! I make a living in pottery, and I
came up with that joke way back in the 1980s. I drew it on the
chalk board at work, and it was up for a couple of months until a
co-worker went to clean off the board. He asked me if I wanted to
make a copy of it, so I wrote it down in my notebook. A year later,
I started drawing cartoons on my pots and this has been one of my
top sellers ever since. You can buy these in my webstore
(www.wallyware.biz). If you type the word “fan” in the discount
section, you’ll get a 10% discount. Best regards, Tom