A Perfectly Ordinary Waiter who is most definitely not a Secret Agent for some foreign power. Nor is he an Alien spying on Earth. Nor is he a Vampire or other supernatural creature. He is most certainly not slipping mind-control drugs into the sandwiches.
If you don't believe he's a Perfectly Ordinary Waiter, then perhaps you'd like a sandwich...
https://np.reddit.com/r/rational/comments/5ehpsd/d_wednesday_worldbuilding_thread/dahh0ym/?context=3