Fedex has a history of refusing to knock or ring the doorbell when delivering. Don't be surprised if you get a door tag despite being home, and waiting.
If you live in an apartment building, they my not even bother to walk up the stairs.
That's really all that needs to be said. There is a 100 word count though. Here are some other words for you.
Flipper. Slipper. Dogbeans. Milk Tank.
Farm Storage Units. Milfdog Soup. Seriously this 100 word junk... Chocolate Spandex.
Giant Slug. Fishsticks. Doorknob. Bacon.
Fruit Loops. Hamburger Helper.
Tennis. And last but not least, Checkers.