Some people at work have this annoying habit of sending you an important email, and then popping into your cube (Yes, I work in a cubicle "office") or call you on the phone to say "I just sent you an email".
Look, if it is critical information, call or show up first, and say "I need to send you some information about this...". Or, send a text message to my phone that says "important: check your email". And give me time to read it.
What always happens is I am sitting there, trying to digest this important email, and the person runs in and says "Did you get the email?" and then proceeds to tell me what is in it!