The first one is Taurus. Taurus is simple. There is only sincerity and frankness in their dictionary, so sometimes they even jump three feet high to express their inner joy or sadness, which is very casual. In fact, they have become accustomed to it, and it is not surprising that we should become accustomed to it.
The second is Aries. Aries's mood is also straightforward. They are carefree and feel that nothing is a problem. They are really super invincible. They have no bad plans for anything. They are docile unless there is an emergency. Laughing happily never hides anything.
The third is Scorpio. They are as straightforward as three-year-olds and laugh happily. They eat with an open stomach and do whatever they want. They don't need to think too much. Their reaction is almost as simple as 1+ 1=2. They refuse to try their best when they are in contact with others, and will try again after a big fight. Very casual.
The above is the constellation I summarized. They laugh when they are happy, which is very casual. Of course, this cannot be used as a comprehensive standard. This is just a statement in the constellation, depending on different factors. ?