The 28th of December is Holy Innocents’ Day, which commemorates the massacre of the innocents by Herod in Matthew’s gospel (although according to Wikipedia, it’s probably not a historical event). In Spain and Spanish-speaking countries, it’s the Spanish equivalent of April Fool’s Day.
For example, one year I told my husband that the police had been around asking whether he’d been jogging in the nude. Now my husband does go jogging, but not in the nude — although sometimes he goes topless. Anyway, I said the police had had complaints about him jogging nude, and wanted to talk to him urgently, and I’d like it cleared up too, because I found the whole thing terribly embarrassing. And I kept it going for about ten minutes before I collapsed into giggles.
So watch out today.