Toward the end of January 1999, a child choked and died on a Mewtwo Power Bouncer ball.  The Pokemon Kills site reports:  
 

On JANUARY 30th 1999, seven year-old Robert J. Brazier passed away when the "POKEMON POWER BOUNCER" he was playing with became lodged in his throat.  Despite the valiant efforts of his family, neighbors, EMTs, the Fire Department and emergency room doctors and staff, the Pokemon Power Bouncer could not be dislodged because of its size and consistency.  Robbie suffered a slow, painful and agonizing death.

Because of this incident, the parents posted a website entitled "Pokemon Kills," but the site doesn't seem to be accessible anymore,