Big Bang Theory - Knock Formula T-Shirt Color:Green this is a killer hoodie

this is a killer hoodie from the band that brought the heavy back to death metal

with a Dalek matching at the bottom

The silver moons have a nice shine to them and together with the black background and blue shuttle give this shirt an awesome color scheme

Neutral camel colored tee with turquoise and green earth shoulder pattern and medallion

and a functional buckled chin strap

Big Bang Theory - Knock Formula T-Shirt Color:Green this is a killer hoodieSheldon poses against the Fibonacci spiral in a Lantern inspired graphic on the front of this green, 100% cotton t shirt from the Big Bang Theory, with his tradmark door knock mathematicized on top. You may not know the math, but you'll know the knock for sure.