The first alchemist that I know of gave me this kind of impression, sorta really influenced how I think of alchemists, even FMA couldn't neutralize it. He would probably make you a love potion if you insisted though.
i don't remerber where i took this, sorry. But when i found it, i just couldn't resist XD And no, he don't do this face in real i think it's just a fanart or some thing like that