Arsenal v Manchester United: classic encounters

Patrick Vieira shoves Roy Keane at Highbury. (©GettyImages)

Patrick Vieira shoves Roy Keane at Highbury. (©GettyImages)

Jens Lehmann can

Jens Lehmann can't stop Cristiano Ronaldo's penalty in 2008. (©GettyImages)

Van Persie against Arsenal, having switched allegiances in the summer. (©GettyImages)

Van Persie against Arsenal, having switched allegiances in the summer. (©GettyImages)