alan guth's sense of humor

In the frame of the Earth, all the objects (the elevator, the man, and the
groceries) are accelerating downward under the force of gravity. But in the frame
of the elevator, everything appears weightless. (Well, all is weightless until the big
crunch occurs in the building’s basement — but remember, this in only a thought
experiment. No living creatures were harmed in the writing of this paragraph.) -From Alan Guth's lecture notes

While I am currently hopelessly confused at deriving metrics for non-Euclidean spaces obeying general relativity, at least I get thrown a bone every once in a while. Don't worry! Nobody was hurt! They repeat this elevator thought experiment in every class involving general relativity in the universe, I think. But nobody was ever harmed!

:-P

(later note- found another one):
One further simplification is known as the Einstein summation
convention. This is no doubt Einstein’s most important contribution to ecology,
saving barrels of ink and tons of paper each year. The convention stipulates that
whenever an index is repeated, it is automatically summed over the standard range.

Haha. Einstein's contribution to ecology. Obviously his greatest talent in life.