Some novelty gifts are pretty amusing, but I think I find this one a bit more disturbing than amusing. From the product description:
Squeeze the rubber chicken and a realistic-looking egg complete with yolk and swirling albumen pops out of its behind and disappears again when you let go.
Partybox will sell you one for £2.20 (about $4.40 US). Your demented friends will get a kick out of it.