Here is some food for thought to consider. If Paul taught in 1 Corinthians 14 that people would think believers were mad if they heard a bunch of speaking in tongues in a gathering, what would he say about the laughter and being slain business? Speaking in tongues is biblical. What about these other ‘manifestations?’
Here is where we must go to the Bible and we do not find these things there. Neither is taught in the Bible, nor do we see evidence of either in the stories found in the Bible. This should be very telling.
What is accomplished when people laugh out of control, especially during preaching or teaching? It certainly is not edifying. In addition, Paul taught that the spirit of the prophet is subject to the prophet. This means that as believers, we are in control of what we do and allow.
The passages used to support laughter and being slain are taken out of context and never show anything remotely similar to what goes on in churches that teach and support these things. But because they happen in a church setting, many blindly accept it as being from God. In addition, some in ministry threaten people who would speak against such ‘moves.’ (For example, think Hinn and Hanegraaff.)
Experiences can be real, but real experiences don’t necessarily translate as being something God ordained.