Pyramid Head enjoying some Cake

It's a pyramid's birthday, and he's trilled! So is his best friend, Mr. Pyramid, but his two enemies are upset

aww that one daft punk pyramid is saying happy birthday to the other but the red and blue pyramids are jealous.

PYRAMID PARTY

It's the pyramids birthday, Hooray !

two buff men with awkwardly shaped triangle heads saying happy bday to eachother

Pyramid Head Birthday :D

happy birthday is written on the top in red with some unidentifiable picture

A man is unsure if being wished a Happy Birfday is a good thing or bad...