Back in December Man Utd played out a 1-1 draw with Swansea at the Liberty Stadium. The game featured an incident which saw Ashley Williams smash the ball into the back of Robin van Persie's head.
After the game Alex Ferguson while being interviewed on Sky Sports said that van Persie "could've been killed".
They don't forget easily in Wales (at least stuff that happened nine months ago anyway) because during Man Utd's win over the Welsh side on Saturday the Swansea fans had a special chant ready for RVP.
http://www.youtube.com/watch?v=mYZzGxDZlMU
The incident.
And the Alex Ferguson interview.
http://www.youtube.com/watch?v=18BFg2WXKOI