Kamehameha

The Kamehameha was invented by Master Roshi by practicing for fifty years spanning pre-Dragon Ball. 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. To Roshi's surprise, Goku successfully performs the technique on his first attempt, although it is only strong enough to destroy the car that Yamcha gave to Bulma earlier.