According to Goku, the Super Saiyan transformation comes in response to a need, not a desire. In all known cases, the form has been initially triggered by either desperation or indignation. Any other conditions are unknown, and motivation tends to differ; for example, Goku achieves the form out of anger over the murder of his best-friend, Krillin, and Vegeta achieves the form through sheer frustration at his original inability to achieve it, especially over Goku. While training in the Hyperbolic Time Chamber, Goku tells Gohan that becoming a Super Saiyan is powered by rage and told him to imagine Cell, and then Frieza when Gohan said he had never seen Cell, killing all his friends to transform into a Super Sayian. Saiyan hybrids are naturally skilled at this, as they have the emotion of Hu