It seems that Elmo is actually the evil stepchild of Chucky and his bride. Actually the mother probably screamed, "I do! I do! OOOOOh, me, me, me" following 43 straight hours of hear the child hit the same button before finding the "Who wants to die?" button.
local6.com - News - Toddler's Talking Elmo Book Asks 'Who Wants To Die?'