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...
And that's what you've been giggling about?
وهذا ما كنتَ تُقهقه لأجله؟
Und darüber musst du immer noch lachen?
¿Y de eso te reías?
¿Y de eso te reías?
Ça te fait rigoler d’y repenser ?
Tu es un drôle de garçon !
E ripensarci ti fa ridere?
Foi por isso que ficou rindo?
Тебя это так смешит?