Souma is really susceptible to cracking up, and even memories will put him into laughing fits. But being self-conscious about this, he always tries to hide it. When he does this again at a clothing store his friend works at, the friend asks him why he does that, especially when it's so easy to tell anyway. Later, Shun also repeats the same sentiment...
I knew that.
توقّعتُ ذلك
Ich wollte dich nur testen.
Ya lo sabía.
Ya lo sabía.
J’avais vu.
Lo sapevo.
Eu sabia disso.
Я знал.