Before me are all the required elements for a mellow Friday night:

One (1) mug of coffee for cat-like reflexes.

One (1) book of Integrals, Series, and Products (Gradshteyn & Ryzhik) for my research.

One (1) bottle of Sherry, to be feverishly opened when I realize the breakthrough my supervisor and I have been waiting for all these months will NOT be happening tonight.