I remember back in 7th grade. It was one of those days. The class was very farshluffen, no one was really into what was going on. Finally the rebbi says, “Is it Thursday today?” We responded why do you ask? He said “Because we say in Thursday’s shir shel yom ‘Sfas lo yadati eshma,’ and all I seem to be hearing from anybody today is lo yadati!!”