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...
That reminds me. I didn't 
know you lived this way.
تذكّرت. لم أكن أعلم بأنّ مكان
إقامتك من هذا الطريق
Sag mal, wohnst du
schon immer in dieser Richtung?
Por cierto, ¿tu casa quedaba por aquí?
Por cierto, ¿tu casa está por aquí?
Ta maison
est pas à l’opposé d’ici ?
Aspetta, ma casa tua è qui in zona?
Aliás, não sabia que você
morava pra esses lados.
Кстати, а где ты живёшь?