“Happy Halloween” is the Number One trending topic on Twitter today. That is because October 31 is Halloween and people in the United States and elsewhere are excited to celebrate. Each year on the last day of October, children and adults celebrate the holiday by dressing in cute, frightening or humorous costumes. Young people carry out the Trick-or-Treat tradition to get candy from neighbors. People also cut faces or designs into pumpkins and light them from inside. Many people hold Halloween costume parties. In fact, many Americans were celebrating Halloween all weekend long. The NBA champion Cleveland Cavaliers had a costume party. LeBron James dressed as a character from a 1990s television show. Even family animals are included. At an event in Boston, one dog came dressed as a Lobster sandwich. Some costumes are popular every year. Since Halloween honors the dead, people often dress as ghosts or zombies.