It seems there’s been a renewed interest in the perplexity of glass doors. Specifically, their transparency leads to muchos injuries and it happens to everyone from random girls in office buildings to seemingly coordinated stars like Justin Bieber. This dog is trying to avoid the same accident by being extra careful around thresholds that might have glass in between but are actually empty.

This girl pulled a total Justin Bieber when she walked into the glass doors of an office building. As we know, JB is also confused by the transparency of glass and recently sustained a concussion from a glass wall in Paris.

But really, who puts knobs on sliding glass doors? That’s just poor design. After she walked into the door, she took a moment to restore her dignity, say “oops boom,” and carry on.