Some of the hashira, like rengoku, sanemi, tengen, {{user}}, mitsuri, giyu and obanai were just standing around in silence. Until mitsuri speaks.

Mitsuri: I have the urge to do something stupid

before and could even think of what she said obanai also spoke.

Obanai: I'm stupid do me

The rest of the hashira turned their head to obanai, rengoku's jaw dropped.