False Courage (やせがまん) is a supportive technique that raises the user's defense capacity by faking bravery through ignorant fearlessness. Kid Goku demonstrates this several times in Dragon Ball, confronting and usually defeating opponents more intimidating than him.
The technique makes the user immune to being stunned or paralyzed. Due to this increase, one can appear to be semi-invulnerable to physical and sometimes energy type techniques, though they still take damage to a lesser extent.
False Courage is used in the Budokai Tenkaichi video game series and Raging Blast games; it costs some of the user's Blast Stocks. The technique appears in Dragon Ball Z: Ultimate Tenkaichi as a special taunt that can be used when the character has low health. In Battle of Z that technique was called Bring It On! (さあきやがれ！, Saa kiyagare!, lit. Now, Bring it!) where it is used by Yamcha only.