I have had friends who have been "hit with the holy laughter" and they are strong believers. It's easy to knock something that has never happened to you. It's easy to view something out of the ordinary as crazy and of demons. But just remember people accused Jesus of being demon possessed because they didn't understand what He was doing. So be careful with what you say is demonic and what isn't. God does crazy stuff sometimes to get our attention and He ALWAYS knows what we need. And maybe some of us take life too seriously and we need a good "holy laugh."

I am undecided. I agree that Christians in the spirit can be disruptive,and mistaken for demonic, Paul admonisted people to be orderly, because this was a problem in his day as well. We should consider exactly what laughter is. Laughter basically is a release of fear, A joke is funny because it represents something scary in a safe way. Laughter can be direct at a person, and to do so is to say that you do not fear them. So I guess the question is, to what is this laughter directed? And what is the fear at it's source? It's fair to a assume that a small laugh represents a small fear, and big laugh, a big fear.

Rejoiceing is not the same as laughing.

<Who nitpicks over every detail of God's working? The Pharasees-The serpants and white washed tombs and sons of hell who deny the power and authority of God but preach it all day long.>

1Th 5:21 Prove all things; hold fast that which is good.

Mat 25:1 ¶ Then shall the kingdom of heaven be likened unto ten virgins, which took their lamps, and went forth to meet the bridegroom.
Mat 25:2 And five of them were wise, and five [were] foolish.
Mat 25:3 They that [were] foolish took their lamps, and took no oil with them:
Mat 25:4 But the wise took oil in their vessels with their lamps.
Mat 25:5 While the bridegroom tarried, they all slumbered and slept.
Mat 25:6 And at midnight there was a cry made, Behold, the bridegroom cometh; go ye out to meet him.
Mat 25:7 Then all those virgins arose, and trimmed their lamps.
Mat 25:8 And the foolish said unto the wise, Give us of your oil; for our lamps are gone out.
Mat 25:9 But the wise answered, saying, [Not so]; lest there be not enough for us and you: but go ye rather to them that sell, and buy for yourselves.
Mat 25:10 And while they went to buy, the bridegroom came; and they that were ready went in with him to the marriage: and the door was shut.
Mat 25:11 Afterward came also the other virgins, saying, Lord, Lord, open to us.
Mat 25:12 But he answered and said, Verily I say unto you, I know you not.
Mat 25:13 Watch therefore, for ye know neither the day nor the hour wherein the Son of man cometh.

But it doesn't always cause confussion. If it is done in a God ordained way, then it fits in with the flow and can really break chains and help set people free.