Pull a Witness

When one has befouled a public washroom to such an extent that they will go to any lengths to NOT be found out as the culprit.

As demonstrated by Lukas Haas in the 1985 Harrison Ford film 'Witness'. Wherein, Haas hides from a suspicious Danny Glover in a public washroom.

I walked into the bathroom at work less than two minutes after Jamie and the stench was unimaginable. I looked to the stalls to see if his shoes were present, but he was totally trying to pull a Witness - trying not to get caught fumigating.