According to Mitch Michaels' "Today in Rock History", on this day in 1965 the Who got into a little tiff...
"1965, At the end of a European tour Roger Daltry knocked out Keith Moon and was sacked from The Who. The band were playing two shows in one night in Denmark, when an argument broke about between all four band members. Daltry was reinstated the following day."
This is what The Who looked and sounded like in 1965...