Q. T. McWhiskers

Q.T. McWhiskers is an invention by Professor Farnsworth. It is intended to be a cat shaped children's toy which, when petted, shoots rainbows from its eyes and says "meow". The rainbows emitted do not appear to be dangerous to humans. They are, though, powerful enough to light cigarettes if held close to the eye. However, Mom (who at the time was dating Farnsworth) wanted to weaponize the toys by making them 8 feet tall and replacing the rainbows with neutron lasers, in order to cause mass destruction and gain money from the intergalactic arms market. This proposition angered Farnsworth, leading him to break up with her, thus beginning their conflict.

Undeterred, Mom proceeded with her modifications and re-purposed the disturbingly charming toys as giant intimidating and destructive weapons, specifically to support the Mother's Day Robot Rebellion which took place many years after the original toy's creation. In retrospect, Farnsworth didn't mind how big or destructive the toy/weapon was, until Mom suggested building a 16-foot model, which he believed was ridiculous.

Trivia

 * In "The Devil's Hands Are Idle Playthings", Q. T. McWhiskers appears on the "Wheel of Robots".