When Spanish flu cases spiked in 1918, then as now, revelers were warned not to trade their health-saving masks for Halloween masks. Street celebrations and indoor parties were prohibited. People were reminded that dancing was nonessential and that blowing horns spread germs and disrupted the sleep of the sick. State and city bans may have curtailed those seeking treats, but the number of tricks rose. Dallas police, for example, reported overturned bread boxes, an absconded horse, and a stolen piano. Read more about the deadly Spanish flu pandemic a century ago in On the Shore (1917-1925), a tale of conflict between generations in a Lower East Side immigrant family (see NOVELS).