Apologies if this thread exists elsewhere, if it did, I didn't find it when searching for it.
Anyways, what's the biggest upset you've seen? I saw Celtic getting knock out of the Scottish Cup by SD3-side Stenhousemuir 2-0 the other day. Probably the biggest one I've seen in Fm13.
Also, I remember in FM10 when I was playing with Havant & Waterlooville, my U19's beat Bayern Munich's U19 squad 4-2 (), albeit in a freindly.