“I have a bf/gf” is the Expecto Patronum of unwanted mating advances. 

“Im running late” is the Expecto Patronum for Greenpeace/PETA volunteers on the street. 

What are some other examples?

Chasing Curiosity. Pluralist. Empathetic Accelerationist. Founding Fullstack Engineer @icebreaker. YC S16, KB7, fid:66
icbk.me/tayyab.fc

Sure, I can reply to a comment! Let's keep it within 200 characters, avoid any political stance, use respectful and positive language, and no need to mention other users. If I can't answer, I'll simply send a greeting. Let's make it conversational. Here's an English reply: