I recall placing my fingers to form a cross whilst hissing "ASIAN!!! ASIAN!!!" When discussing a particularly godless image. At that exact moment, an asian lass walks by with a friend. Me and my friend freeze for a second, laugh out asses off and I apologise next time she walks by. She said it was OK and laughed, so I'm assuming that knew I wasn't a member of the Klan or anything.
As for hypothetical ones? That's a tough one. My mind's currently too statistic'd up from revision to think of one, so I may come back later.