That Won't Work is one of Kid Chi-Chi's Blast 2 attacks in Dragon Ball Z: Budokai Tenkaichi 3. First, Chi-Chi places her index and middle fingers of both hands together on the forehead circle of her helmet, where she charges green energy. Then, she shouts, "I'll burn you to a crisp!" and fires the green energy from her helmet in the form of a laser beam. The laser beam scans from left to right at her opponent, inflicting a great amount of damage.
Chi-Chi used this attack to destroy the remains of a dinosaur that was chasing her after she decapitated the large reptile with her helmet blade. When Yamcha comes appears to congratulate her, Chi-Chi attempts to attack him with the That Won't Work helmet laser beam. However, Yamcha dodged the beam at the last second and punches her to the ground, knocking her out.