Cat tries to join me in the bathtub?

I had the same problem with my cat! lol when ever i would take a shower or take a bath he would cry to come inside, [even though i knew he was scared of water] i let him in anyway. he was calm for a second then he was hanging by my thigh with his nails!!! ugh, it was soooo painful, my advice, don't open the door, or spray some water in his face so he can go away.