Kamehameha

History
The Kamehameha was invented by Master Roshi. By drawing his latent ki into the palms of his hands, Roshi is able to expel an explosive beam of ki energy. Goku learns it after witnessing Master Roshi unleashing the blast to extinguish the flames at Ox-King's home on Fire Mountain. Goku successfully performs the technique on his first attempt. It was also learned by Krillin and Yamcha who use it during the 22nd World Martial Arts Tournament against Chiaotzu and Tien Shinhan respectively. After they learn the attack, they teach it to others, and the attack becomes a very popular one to use during battle. Cell is also capable of using it due to the cells of all these people within his design. Majin Buu learns the technique after seeing Goku perform it during the Majin Buu Saga.