I will add my similar experience.
My whole family witnessed this together. And I thank my mother for this, as she is the most religious of us all.
This happened during fajr prayer. My mother used to pray in our lawn outside. That day right above our house the sky was full of the names of Allah and Muhammad, the background was full of colorful flowers (yes colorful).
She wanted all of us to see it too so she called us all out. All of us saw it. We saw Bismillah (complete) in arabic written as clear as anyone can write it with a fine pen. Then it transformed into the Kalimah, in Arabic. This was happening on the left side of the sky. While Allah and Muhammad was written on the right side of the sky.
The kalimah then turned into a sword that spanned the length of our house (pretty big in Pakistan). And the sword swung from the left to the right (while the place you hold it remained there) as if someone swung it. My mother said this was the sword of Ali- who knows.
During this time there was also light rain on our house, while taking even a step outside our house there was no rain.
There were no huge clouds there. And on top of our house the only 'clouds' were just the stuff that was written the thickness of which was as if it was written with a pen. With all the Arabic properly dotted.
I was at the time 10 I think.
Now you atheists start laughing. I'm not going to argue though.
Peace be unto you