this is not a mysterious thing now-a-days both girls and boys at some event or before doing something hilarious, funny or creative work they do this type of thing to amaze the people there.
i remember when i was in 1st year in college, every friday was a color day and that day there was a birthday celebration of our friend so we all friends made a plan to wear our uniforms and let's surprise him
the staff and teachers were as shocked as that man in the picture and you also sir.
They said the best memories can only be made by doing something crazy or as adorable as it has to be

Thank you sir @velimir for sharing this moment with us that reminds me of my past memories :)