donate your OWN blood; drive-bys don't count

I saw a truck on the street that said "Be a Blood Donor" on its side and back panels. However, when the back door of the truck was pulled partway up (such as to conduct a blood drive), all you could read of the back panel was "Be a Blood," so at first I thought it was a truck for recruiting gang members.

Now if only the Jerry Lewis Telethon had a truck that said "Be a Crip--"

Well, actually, it would be more likely to say "Help a Crip--"