How to address a Christmas Gift

The Herd of Cats way

This was on a Christmas Gift from Moricerevek to Ubergeek Q-Bert. What I don't understand is why was Moricerevek yelling?

Here it is written out in full to make it easier for you:

01010101
01010011
01010101
01000011
01001011

Proving he is an ubergeek, Q-Bert figured it out after translating the first letter and realizing the first and third letters were the same.

Proving, to the dismay of all, that he wasn't really an ubergeek he failed to do the Binary to Text translate in his head. He used his iPhone.

Oh, and here.