The entrance of the Anne Frank House museum, in Amsterdam, Netherlands, on Nov. 21, 2018.EVA PLEVIER/Reuters Dutch police said Friday they are investigating a stunt that saw a text alluding to an antisemitic conspiracy theory projected onto the Anne Frank House museum in Amsterdam, causing outrage across the country. The words “Ann (sic) Frank invented the ballpoint pen,” referring to a debunked claim that the Jewish teenager’s famed diary is a forgery, were displayed for several minutes this week on the side of the building where her family hid during the Holocaust. The 17th-century canal house is now a museum...