Has anyone seen The Perfect Host, starring David Hyde Pierce?
"A criminal on the run cons his way into the wrong dinner party where the host is anything but ordinary."
It doesn't seem to be widely available on Region 2 DVD for the UK, but a friend managed to download a copy. Definitely worth a watch for Frasier fans.
Warwick Wilson (David Hyde Pierce) has some scenes which very much reminded me of Niles, but much stranger! I thought the film started to lose its way a bit towards the end, but some scenes were hilarious.