When I was teaching at Purdue, I was always annoyed by advertisers who’d write stuff on my chalkboard with a big “Do Not Erase!” (DNE) next to it. Sometimes half of one of the two chalkboards was covered with book buyback/make money fast schemes. I often erased them, because I’m evil like that.
Apparently, the guy who writes xkcd has had similar experiences – here’s his variant: ( 
):
Can I just say again how much I love xkcd?
Oh, and I guess this puts me into R-rated blog territory, even if it’s harder to detect. Bad me
Professional computer geek and linguist living in Germany, doing infosec stuff and being the freakiest mother ever.
