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 bet if we invite my older brother too,
،أنا واثق بأنّنا إذا دعينا أخي الأكبر أيضاً
Wenn wir meinen Bruder mitnehmen,
könnte er uns fahren.
Si invitamos a mi hermano,
podríamos ir en auto.
Si invitamos a mi hermano,
podríamos ir en coche.
Si on invite mon frère, il conduira.
Se invitassimo anche mio fratello,
potremmo usare la sua auto.
Convidando meu irmão,
Если позовём моего брата,
он отвезёт нас на машине.