Ever since Ivar Haglund scuttled his schooner off Alki Point in 1851 and founded "Hagtown" (name later changed to "Seattle" when it was discovered that "Hagtown" means "anal hook" in Salish), indie-horror-comedy has been our fair city's number-two export (after Aplets but just above Cotlets). Slashacre—a collaboration between Crypticon and the Beta Society—celebrates that storied tradition with a fine collection of hee-larious spookies from Seattle and beyond. Blood Squad performs its horror- movie-improv; Andras Jones, star of A Nightmare on Elm Street 4, gives mystical advice; and David Katims, of Friday the 13th Part 3, tells jokes. (Historic University Theater, 5510 University Way NE, www.thebetasociety.com. 8 pm, $10, all ages.)