COLLIFATE - in Spring 1928 the entire sitting math class at Dublin University was composed entirely of students (both male and female) whose first names were claimed to be "Colleen".
This incongruity (or congruity) caused the math teacher (whose name was not "Colleen"} to exclaim...

"Well, mathematically a colligate such as this is sooner or later destined to occur. But non-mathematically speaking, the odds are dead even that these names will re-occur in this same class next year".