Neurological damage caused by mercury used in the curing process of felt was one of these reasons hat makers were known as "Mad Hatters" in the 19th century.
... Sorry if I've ruined Alice in Wonderland for anybody now. :/
Looking back we have now invented a whole back story for "Carl",the guy on the left in the red t-shirt,oblivious to our wedding party!
Or maybe "Carl" is a long lost acquaintance wondering why you guys forgot about him and left him out of the wedding. (He just has a really good poker face about it.)