Following a Google link to something else (which I've completely forgotten, at this point), I spotted this item on the page, sadly already purchased by some lucky and/or freakish bidder: 1974 Vinyl Clown Head For Helium Machine. Of course I rushed to alert Sis immediately, having wrapped several of her last birthday gifts in Creepy Clown paper (bless you, Archie McPhee).
The seller is really, really into the Clown Head, don't you think? Twice, she mentions what a great mask he would make for Mardi Gras. Or, you know, for when you brutally slaughter your next serial victim.
"He easily slips over your head (I know. I had it on when my husband opened the front door for me when I brought it home)." Counseling. I recommend counseling.
Oooh, agh--look at the other picture, the one of the flesh-toned Vinyl Clown Head interior. SHUDDER.