Submitter Ian tells us, "I found this sign with a shredder. Strangely, it was already in an electronics recycling bin." I don't know what's going on with that, but if you think about the word "discard" a lot it gets weird fast.
If you're into additional grammar and punctuation based joking around, check out this very active facebook group. They post some quotation marks stuff from time to time as well, and will also enjoy other kinds of errors folks sometimes send me, such as apostrophe mistakes, homonym errors, whatever.
I wonder if the marketplace will ever show up at all, or if it will just take an outrageous amount of time (kind of like it takes for me to post submissions on this blog -- sorry everyone! I wonder if there's a marketplace there now). Thanks Matthew.