Anybody use a mirror as a screen??

We have an old bathroom mirror 85" x 58" and we are going to do a bathroom remodel soon..Wife wants the mirror, along with everything else gone ..Got me to thinking ..Could you paint the back of one(or front ,i guess it won't matter) white and have it work as a screen?
I actually saw a vid on you tube from screen goo and they painted a window ,so ,i think a mirror would work just as well

Oops ,maybe it can be moved then...

Thanks, I never even thought of it ,nor have i priced screens yet..I was thinking they were 800+ for just a moderate one..Seems you could get a decent one for under 400-500...
So,you wanna buy a mirror ..wonder how much i could get for this thing