According to this report on Haredim10, yesterday bugs were found in the "ptitim" served at lunch in Yeshivat Chevron. It took a while to notice the bugs, so many had already eaten from the infested pasta by the time they did.

In response, upon consultation with the Rosh Yeshiva, the students decided to accept upon themselves to fast today, Monday, for half a day, on "BeHaB".

Interesting response.