I can understand this completely.

We were invited into coffee with a group of Muslims in a land far, far away. To refuse their hospitality would have been a detriment to our mission. Yaking up the coffee onto their rugs would have been almost as bad. The group of soldiers I was with warned me it was strong, but I almost lost it any way.

I must have brushed my teeth 5 times after we left, and still had the after taste that night when I went to "bed".