Speaking of which, I've seen Hungary ally France at practically game start, get called into the 100 years war and England sending guys to wreck Hungary's armies and siege their coastal provinces. Instead of sending them to fight the french, which would be smarter.
In two different games I have also seen England sieging down Pisa, after Tuscany allied with France. Now playing as an Italian minor I wait for the end of the HYW before allying France because I fear England..