Seki-kun starts playing fuku warai in class... however it wasn't any old normal fuku warai! Yokoi-san is unable to look away from the surprising turn of events!
O-Oh, no! I totally just laughed during class.
O-oh nein! Ich hab gerade laut gelacht.
¡O-oh no!
¡O-oh, no!
A-Accidenti! 
Mi sono messa a ridere durante la lezione.
E-Essa não! Acabei rindo no meio da aula.