It’s a Tuesday afternoon in Brooklyn Heights, and Pamela has just arrived at her bachelorette party.  It’s a peculiar one: The bride-to-be appears to be a bespectacled 80-something with a practical coral coat and significant hearing loss. There’s nothing but imaginary salt and pepper on the fold-up table. Plus, the three men posing as Pamela’s ex-husbands are the only guests there. “You’re going to be such a cute bride,” one says. “Again…and again…and again.”  The scene devolves from there.  See Pamela sing “Blue Suede Shoes” in response to husband No. 1’s memory of their time in Graceland. Listen as Pamela sneezes at husband No. 2’s clumsy handling of the “pepper shaker.” Laugh when husband No. 3’s plea for a neck rub gives rise to a more sinister idea: “I could kill him,” Pamela says, hands descending upon her ex’s collared neck.  Every other week, a two-hour improv class for seniors is held at the St. Charles Jubilee Older Adult Center in Brooklyn.…