(also known as: Egyptian Ratscrew, Egyptian War, Slap)
Was very popular in youth group when I was in middle and high school. Requires constant attention and reflexes, good for very competitive folks, not good for conversation. Played smoothly can have a hypnotic quality like Super Hexagon. High-level play almost requires card counting. Additional rules (slap on sandwiches, tens, etc) can be tough to keep track of, but some people really like them.