Hige's message is a reference to the after-credits scene of episode 2 of the anime.

Tapper said:

Hige's message is a reference to the after-credits scene of episode 2 of the anime.

The Japanese are so great at being all smiles and incredibly enthusiastic while doing the weirdest things

OOZ662 said:

The Japanese are so great at being all smiles and incredibly enthusiastic while doing the weirdest things

I think you misspelled "young people" there.