You Doo Dolls

You Doo Dolls are magical voodoo dolls that fairies were, apparently allowed to give to children at one time. However, this practice was stopped because they could be very dangerous. In the episode You Doo, Cosmo reveals the existence of this magical dolls to Timmy much to chagrin of Wanda. Timmy, however, wishes one up for Francis and soon begins tormenting him. Finally after wishing up a whole bunch of You Doo Dolls for everyone Timmy knew and after having Tootie had Francis use the You Doo doll have of Timmy that Cosmo poofed up, it becomes clear that these dolls are indeed very dangerous. After almost getting killed, Timmy's You Doo doll fell into a woodchipper and was nearly cut to pieces, Timmy wished all of the dolls away.