In a courtyard, four teenagers are playing soccer until one of them breaks a window. The homeowner takes the four teenagers to task, but only (exactly) one person tells the truth:
Nicolas: Elena has kicked the ball.
Marc: It was not me!
Elena: Bastian did it.
Bastian: Elena is lying!
Can you figure out who has kicked the ball that broke the window?
Assuming that only one of the statements is true, the following applies:
According to this reasoning, Marc kicked the ball that broke the window.