Our ever-watchful James brought the odd relationship between tea and chimps to light with this passage from the Annotated Prachett File, a weird world of words about which I knew nothing until tonight.
For the entertainment of their younger visitors, British zoos used to have the tradition of holding Chimpanzees' Tea Parties, where the chimps were dressed up and seated at a table, drinking and eating from a plastic tea set.
Chimp tea parties have remained in the British consciousness due to the TV advertisements for PG Tips tea bags featuring chimps pouring tea.
Huh. So there's that.