I don't have a poster but I will recount an incident along the
same vein. We had a teacher in JC who could not get her 'r's and
'l's right. In retrospect, she might be autistic or something.
Instead of 'yellow precipitate', she would say 'yerrow
plecipitate'.
Anyway, it was the Student Council elections. After the results
were announced she went up the the boy who was elected president
and said, "Conglatulations on your erection."