I just saw this movie on cable (not, I assure you, by design). The plot is pretty much as described here in the IMDb. "Hysterical" IS pretty hysterically awful, but it does not quite fit in the category of Movies So Bad They're Good. Yes, the plot is clichéd and predictable. Yes, it stars the Hudson Brothers, those inoffensive pop products from the Seventies who were quickly forgotten in the Eighties. I, for one, certainly hadn't thought about them since then and had no idea they'd made a movie. It also features a gaggle of supporting actors whose faces will be recognizable to anyone who watched movies and TV in the Sixties and Seventies or who watches TVLand today. The female lead is Cindy Pickett, who looks and acts so wholesome here that it's hard to believe she appeared in an earlier film, Roger Vadim's "Night Games," that was very erotic. She radiates essentially no sexual luster in "Hysterical." Still, the production values are surprisingly good for a bad movie. It looks and feels like a real movie; this is not Edward D. Wood stuff. The Hudson Brothers actually manage to work up a respectable comic energy. There are a few breakout scenes that are extremely funny, especially the big production number with dancing zombies in an amusement park, and a too-brief scene in which the brothers try to confuse some pursuing zombies with an impromptu doo-wop session. The movie also works in sendups of a lot of other films ("Vertigo," "Marnie," "The Rocky Horror Show," "Chariots of Fire," and "Night of the Living Dead," to name just a few). All in all, this is a movie that is fun to see once just for laughs.