Sheldon hit the delete key after reading Penny's email. Emoticons annoyed him. But what was more annoying is when he returned to the email program a few minutes later. He had tried reading a journal article, but he couldn't get past the first sentence. Something was nagging him. He moved Penny's email out of the trash--the solitary item in it--and organized it properly. He was constitutionally incapable of deleting email.