Akuma's Seizure is a glitch in Street Fighter IV.
Description
The glitch occurs when Akuma gets hit by a Hyakuretsukyaku from Seth. If Akuma throws a Zanku Hadoken (use the EX version for the best results) and Seth kicks him as he is coming down, Akuma will spin around. However, Seth will be hit with the Zanku Hadoken, canceling the attack. Akuma continues as if he was hit by aforementioned Hyakuretsukyaku, and falls to the floor after a few seconds.
Video
Seth v. Akuma Glitch