Has anyone seen The Perfect Host, starring David Hyde Pierce?
http://www.imdb.com/title/tt1334553/?ref_=nv_sr_1
"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.