Can we do this with Baseball players?

So they don't fear a pitcher?



Obviously in Japan..they have a lot of time on their hands to do this shit..From Reuters:

Dec. 12 - Japanese scientists create a mouse which is never afraid of its mortal enemy, the cat.

The mice have been genetically modified to get rid of certain smell receptors in their brains which react to the odours of cats. Usually mice freeze and play dead when they smell a cat, but these mutant mice just go about life as usual.