With the season of eating leaves and hiding from ghouls well underway, assuming a ghost is using all your barbecue sauce is a logical conclusion, but it’s not the only possibility. Keep an eye out for these common symptoms of a reclusive roommate.

1. Your laundry detergent is running suspiciously low

Studies have shown that between ghosts and roommates, ghosts are less likely to do laundry. If your detergent supply is clearly diminishing twice as fast as usual, your haunter may be one who wears clothes.

2. You’re missing a roommate

One of the first things you want to watch out for is whether or not all your roommates are accounted for. For example, if there are four names on the lease, there should be four people living in the apartment. This is because ghosts don’t sign leases or even pay rent, whereas roommates often do.

3. You sometimes see a stranger in your apartment

If an individual sometimes comes into the kitchen to silently eat their Taco Bell $7 Cravings Box, it may be because they live there. It’s especially likely if the stranger resembles a roommate more than they do an apparition; the key difference is that Provo residents are generally whiter than ghosts.

4. You don’t feel anything when you shake their hand

This is arguably the easiest way to tell if someone is actually the devil as an angel of light. Ask to shake hands; if they offer their hand and you don’t feel anything, you may therefore detect them.

5. You’ve never once heard them say “BOO!”

Come on, guys. Everyone knows that shouting “BOO!” is the first thing on any ghost’s to-do list. If you haven’t heard it yet, then you either have the worst ghost ever or you don’t have a ghost at all.