Metaphor: ReFantazio has several strange ways you can grab yourself some extra skill points or experience, just like in the Persona and Shin Megami Tensei games before it. For some odd reason, modern Persona games have made a habit of going to the bathroom a big part of the games, tying the porcelain throne to the fatigue status in Persona 3, and allowing you to see your social bonds in Persona 5 Royal.
Metaphor: ReFantazio has not been able to escape Atlus' obsession with the toilet, and actually rewards players that visit the John often. In fact, getting rid of "unwanted waste" in Metaphor is quite possibly the most beneficial a toilet has ever been in an Atlus game, as visiting the toilet on the Gauntlet Runner on an Idlesday will increase your hero's Luck stat.
This was first shared on Twitter by user UltimaShadowX, who thought that you could increase your Luck stat by visiting the bathroom every day that's divisible by 5. Fortunately, it's not that complex, as all you actually have to do is relieve yourself on an Idlesday, and you'll get a boost regardless. It's a handy way to increase your stats, and takes no time...