I have probably looked angry while working because people tell me I look angry in general, probably more so when I'm in focused but it has never stopped anyone

I have probably looked angry while working because people tell me I look angry in general, probably more so when I'm in focused but it has never stopped anyone from interrupting me while I'm working. Also mandatory Seinfeld reference: https://www.youtube.com/watch?v=Kafq7yrKAOQ https://www.youtube.com/watch?v=Kafq7yrKAOQ