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'm good friends with the guy 
who works at that store.
أنا صديق جيّد للشخص الّذي
يعمل في ذلك المتجر
Me llevo muy bien con el dueño
de esa tienda, es muy gracioso.
Me llevo muy bien con el dueño
de esa tienda, es muy gracioso.
Je m’entends bien avec le vendeur,
il est sympa.
Ho cominciato a parlare col commesso
di quel posto, è un tipo divertente.
Sou amigo do cara
que trabalha nessa loja.
Я дружу с продавцом из того магазина.