If you see SerirChaz making this face (Or any Chaz, really - it’s a little harder to tell with Chaz GELF but you’ll know), you should probably vacate the premises within a 5-mile area. Not that he’s angry or anything, just a little bit mad with power.
Last time he made this face was when he learned that he could use electronic servos to automatically load up gun turrets in Factorio.
Thankfully that only resulted in the deaths of his intended targets, but still - if a Chaz makes a discovery and he starts smirking (or if you hear him say “Oooooohoohooohoo, what do we have -here-?”) then yeah. Probably best to abscond the hell out of there.