Salespeople are the natural enemy of the receptionist. I apologize if you are a member of that profession but politely disposing of those of your ilk is one of the things I excel at. Very frequently representatives from various companies will show up unannounced and ask to speak to some of our most busy employees. Most of the time a polite "I'm sorry but they're not available" will suffice but other times they put up a fight.
My favorite class of difficult salesperson is Guy Who Is Roughly My Age Who Think He Can Charm Me. Unless you're my husband or a certain tall, British gentleman with a funny name, that tactic won't work. This is where I employ one of the most surprisingly effective weapons in my arsenal: I stand up and continue the conversation at eye level. For whatever reason that simple action throws a wet blanket over any overly-assertive salesman behavior and I can usually contain the situation fairly quickly after that.
So this happened today, of course... I decided to draw what I wish I could do rather than what I have to do to remain professional. It's interesting how every time I draw myself I look different. I have this little army of Characters That Resemble Sarah. Someday maybe I'll finally settle on a style.