1) Two observers A and B move at a relative speed of √3/2 and simultaneously clap their hands as measured in their own frames. Due to time dilation, the separation between them increases by a factor of 4 with each clap of A. 2) Minkowski diagrams provide a geometric way to visualize the problem and show the separation increasing by a factor of 4 with each clap. 3) For observers moving at a general relative speed v, the separation increases by a factor of (1 + v^2)/(1 - v^2) with each clap.