It could mean they are trying not to sound mean or they think what they are commenting or asking is funny. They might just do it out of habit I wouldn't over think it.
Happy
It is when someone laughs hysterically
nitwt
it laughs when it eats someone
yes it is normal
So someone can post the wrong answer for laughs. Hopefully - to get answers, although many teenagers have been known to ask them just to be argumentative, aggravate people, or to be smart alecs.
A protestant christianAn Agelast
you would call someone chuckles when he or she laughs and there tummy bounces up and down
A person who laughs alone can be called a "solitarian" or simply someone who enjoys their own company and finds joy in their own thoughts.
Say that he can't even get a girl
A person who laughs a lot could be described as jovial, cheerful, or lighthearted.
Give the note to him and he if he laughs or embarrasses you, tell him it was a dare and laugh. Any guy who laughs at someone who likes him is not worth it:D