The practice of deliberately saying you did not witness any controversial incident, just to avoid either further discussion, or any involvement.
In post match TV interviews, whenever
Arsene Wenger the manager of
Arsenal Football Club is asked about a controversial incident, where say one of his players committed a bad foul, or handled the ball for which the
referee didn't award a free kick, he always says; "I didn't see it."
Despite it happening immediately in front of him, when asked by
the police if he'd witnessed
the accident,
the driver went "All Arsene Wenger."