Regularly random: 36 Methods of Mathematical Proof

Some are particularly nice ;-)

Proof by obviousness
"The proof is so clear that it need not be mentioned."

Proof by general agreement
"All in favor?. . . "

Proof by intimidation
"Trivial."

Proof by mumbo-jumbo

" (B Ì P ) , $ (C Î W )

Proof by profanity
(example omitted)

Proof by illegibility
(scribble, scribble) QED

Proof by clever variable choice
"Let A be the number such that this proof works. . "

Proof by intuition
"I just have this gut feeling. . ."

Regularly random