1. What word does a chess player say to her opponent when she puts his king in threat of capture?

2. What does the ‘S’ stand for in the name of the recently controversial intelligence organization, the NSA?

3. Besides the floor exercise, what’s the only Olympic gymnastics event that both men and women compete in?

4. What Pink Floyd song calls the title stuff “a gas,” “a hit,” “a crime,” and “the root of all evil today”?

5. What magician has been the “silent” stage partner of Penn Jillette since 1975?

What’s the "Kennection" between all five answers?