One or Two You've Heard Of

Dr. Samuel Johnson said that if you were stuck under an awning in a rainstorm with Edmund Burke, you would know in five minutes that you were in the presence of a genius.
In a similar manner, if you were stuck under an awning in a rainstorm with some people for five minutes, you could tell with some of them that you were in the present of an idiot. Brother, I could name one two you've heard of.