Reading an old story by A. Blackwood, I stumbled upon the following sentence (for the context, the woman is said to have some kind of second sight):
And the idea of this motherly, sedate, and wholesome woman, absorbed day and night in prosaic domestic duties, and yet ‘seeing’ things, touched the incongruous almost to the point of alarm.
I cannot fully understand the last part: touched the incongruous almost to the point of alarm. I thought it was a phrase (if something touches the incongruous) but I was wrong.