Is "Slain In Spirit" and "Holy Laughter" biblical? I want answers from biblical point-of-view only.

I did a search and read through many websites about the biblicality of Slain In Spirit & Holy Laughter & almost every websites states that it's unbiblical to have such practices of manifestations. If it's unbiblical, why would there be so many Pentalcostal and Charismatic churches having such practices? I personally didn't experience such manifestations yet but would like to try if it is biblical. Can anyone share with me using Scripture references? Personal experiences are appreciated sharing here. What makes you think it's biblical and what convinces you that it's of the Holy Spirit yet not of the Devil? Under what cirstances would I be "slained, touched or laughed"? What are the effects after being slained? What makes you laugh? Itching or mental unsound? What did you feel and how did you fall? Charismatic preachers such as Benny Hinn, Kathryn Kuhlman, Rodney Howard-Browne, Oral Roberts or any other faith healers really heals? How did they get the annoiting? How to slain others?