Expect a lot of updates about how bad their food poisoning is.
You throw them a leaving party.
Because even though they're about to have a trip of the lifetime, it's important to remind your BFF how awesome their home life is and will continue to be when they return.
You dole out some wisdom.
The CW
Make one last attempt to make them stay.
In this analogy, your best friend is the cat, which is bittersweet because now they've gone, your best friend will probably have to actually be a cat.
Ok, several last attempts to make them stay.
Olive Bridge Entertainment