Thanksgiving Articles about the origins and practices of Thanksgiving. 0 Some common beliefs about Thanksgiving. Eating turkey makes people especially sleepy.* The day after Thanksgiving is the biggest shopping day of the year in the U.S. Clueless cooks in the process of commiting Thanksgiving mayhem call turkey hot lines. Holiday turkey preparation provides set-up for humorous scenarios. The Presidential practice of pardoning a live turkey dates to 1947 and Harry Truman. The Monday after Thanksgiving is the busiest online shopping day of the year in the U.S. George Washington was the first U.S. President to issue a Thanksgiving proclamation. The term “Black Friday” originated with the practice of selling off slaves on the day after Thanksgiving.