Not to sure what the different ideas of Spiritual experiences are with the posters before me or the thread starter but i will share a very real experience i had when i was first becoming a Christian..
One weekend day i was in my flat doing some house work. The TV was on and there was a fast food advertisement on the TV, i was paying no attention to it until i heard the first 666 statement which was aligned to the sound of 3 cans of mountain dew drink being opened.. The add was talking about a family meal deal that included 6 cans of drink.. So when the 666 happened instantaneously my mind became focused on it to an incredible extent and as that happened there was a knock on my door 3 knocks.. and then the add continued 666 again as they opened the last 3 cans..
My heart was now almost coming out of my mouth and i can tell you i was afraid of going and opening that door because my mind was telling me that satan was at the door.. But they knocked on the door 3 more times.. A total of 6 knocks..
I went to the door and opened it.. It was 3 Jehovah's witnesses wanting to talk to me about religion.. Well i did talk to them for a while but i never invited them into my flat.. They offered me a JW bible for a small price.. Can you guess how much it cost? yep $6 dollars...
You can be sure i never joined that religion. That's for sure.