Heh --
What the fuck was up with Giles?
When he left for England, his guilt over leaving Buffy in such a condition led him down a dark path where he ultimately took up sniffing glue. This led to the tragic death of many precious brain cells, which led to him hanging out in crack alleys, begging for some rubber cement. A kind hobo picked him up and dropped him off at rehab, where he underwent electroshock therapy, which cured the glue craving but unfortunately led to the radical change in character.