Pretty funny, which is what I assume was the point... not that the stuff doesn't kill "zombies" real good too.
Btw, in the zombie/survivalist/weapons genra, the term "zombie" is often used to indicate some sort of bad guy, as in actual human... And more specifically, bg's that may have zombie like qualities... Ones that attack in mass as in gang members or al qaeda, or ones that display a zombie like shuffle, or look partly dead, as in skid row/crack heads might. So saying these are for killin' zombies, may be code for, these is good for killing... well, certain humans.