evidence: Another 'sign' of a stroke is this: Ask the person to 'stick' out their tongue. if the tongue is 'crooked', if it goes to one side or the other, that is also an indication of a stroke. While that is also likely true, as a test it is far less valuable than the original three because there is room for interpretation of the results. How crooked is crooked, after all? How far to one side does the tongue have to go before its having done so can be regarded as a clear sign of a stroke having occurred? Better to discard this fourth suggested 'test' in favor of remembering the first three. [...] In 1979, I was teaching in Fung-Gaap College in Tai-Chung. One afternoon I was teaching class when another teacher came running to my classroom and said in panting, "Mr. Liu, come quick, our supervisor has had a stroke!" I immediately went to the 3rd floor. When I saw our supervisor, Mr. Chen Fu-Tien, his color was off, his speech was slurred, and his mouth was crooked — all the symptoms of a stroke.