You'll never guess what happened!

When I was about eighteen years old, I stayed in my house, at night, at home one night with my sister and my boyfriend. We were very bored. Suddenly, we remembered an ouija play. My sister wrote from 0 to through 9 on a piece of paper, and the alphabet, too. She took a rule (ruler?) and put it on the paper. She started and asked, "How old am I?" Amazingly the rule ruler was moving to moved, indicating 20 years old. We were frightened. It was Alan's turn and he asked, "What's my name?" We were concentrated and then the rule was moving moved to A, L, A, and N. Oh my gosh! After, unfortunately, someone (I don't know who) said, "Now if only the water go to finish stops flowing." Alan opened the sink faucet and, strangely, we didn't have water no water came out. We laughed, and then said one more sentence, "Now if only the lights go out"--and then the light went out!

I hope this helps. Some of the longer corrections are just suggestions, because I was not sure exactly what you wanted to say. 

You'll never guess what happened!

When I was about eighteen years old, I stayed in my house, at night, with my sister and my boyfriend. We were very bored. Suddenly we remember a ouija play. My sister wrote from 0 to 9 on a paper and the alphabet too. She took a rule* and put it on *paper. She started and asked "How old am I?" Amazingly the rule* was moving to 20 years old. We were frightened. It was Alan's turn and he asked "What's my name?" We were* concentrated and then the rule* was moving to A,L,A,N. Oh my gosh! After* unfortunately, I don't know who said "Now if only the water *go to finish" Alan opened the sink and strangely *didn't have water. We laughed, and then one more sentence "Now if only the lights *go out" and then the light went out!

'rule' :  ruler

the paper

we concentrated

afterwards / later

the water would go to . .

it didn't have (any) water

the lights would go out