Another Evirus' secret message was a caption "holy shit, the teacher is wearing bolo tie" for this picture:

I am not sure if the sight qualifies for a "holy shit". These things occur in anime now and again:

I didn't know what it was called until after I bought one:

No idea why "Bolo". Supposedly, the short C-96 Mauser was called "bolo" as shortening of "bolshevik". This one may be some kind of Mexican slang. Guessing why anime characters wear those is even more remote.

BTW, bolo may be a focus point for recurring posts for someone, like mikan boxes are for DiGiKerop. Dibs on choker.