english: Something that Robert Provine has pointed out, as you can see here, and the reason why we were laughing when we heard those funny laughs at the start, and why I was laughing when I found my parents laughing, is that it's an enormously behaviorally contagious effect.
non_english: Nešto na šta je Robert Provajn ukazao,  kao što možete videti ovde i razlog zbog kog smo se smejali kada smo čuli sav zabavan smeh na početku i zbog kog sam se ja smejala kada sam naišla na svoje roditelje je da je to u ogromnoj meri  bihevioralno zarazan efekat.