[irrational]

This reminds me of the old joke that PhD stands for "Pile it on Higher and Deeper".

[wrp]

It goes B.S. => More of Same => Piled Higher and Deeper.

[kohanz]

BS = Bulls---

MS = More s---

PhD = Piled higher and Deeper

[mordae]

I prefer this one: http://matt.might.net/articles/phd-school-in-pictures/

OTOH, I bear neither.

[sharemywin]

My favorite was D stand for Diploma...

[clueless123]

When you think you know everything you get your BS

When you find out you know nothing, you get your Masters

When you realize no one else knows either you get your PHD