Set in 1974 in the Welsh village of Llagoelwyn-On-Wrst, How They Threw Rocks features Alwyn Lewis-Ifans (Trystan Gravelle), the beloved champion of the rock-throwing sport known as Craig Maes, in an ingenious riff on Leon Gast’s landmark 1996 documentary When We Were Kings. Also starring Sir Tom Jones and Jonathan Rhys Pryce.