Years ago, a white woman told me about how her son's teacher let the class dance to a Michael Jackson record for 10 minutes to celebrate Black History Month.
Once a teacher celebrated Black History Month by letting the class dance to a Michael Jackson record for 10 minutes. 
mnli hypothesis: Once a teacher celebrated Black History Month by letting the class dance to a Michael Jackson record for 10 minutes.  premise: Years ago, a white woman told me about how her son's teacher let the class dance to a Michael Jackson record for 10 minutes to celebrate Black History Month.