KELOWNA, BC—Frequent party host Tracy Al-Majed has developed an ingenious strategy to identify undesirable party guests and prevent them from returning to her loft.

"It's super simple," Al-Majed explains. "I borrow my friend Ali's acoustic guitar and put it somewhere slightly out of the way of the party. Against a hallway bookshelf, or on the bed with the coats. It's really important that the guitar doesn't look it's just out in the open for people to pick up and play."

Al-Majed says the guitar provides a crucial guest quality monitoring service while she is busy hosting.

"It's awesome," she says. "My apartment is small enough that even in another room I can hear when someone is playing it. Then I just poke my head in and immediately know which of my so-called friends is huge shit."

Al-Majed says she has even developed a ranking system that helps her determine the severity of the offense being committed.

"If someone just plays a couple Tragically Hip covers and puts it down, I can maybe let it go. Maybe," she explains. "But if they play a song they wrote themselves, they are absolutely never coming back. If they straight-up look me in the eyes and ask me to turn the music down so they can play a song they wrote themselves, I kick them out right then and there with no explanation."

"They know what they did," she adds sternly.