Worst extension ever?

What you think was the worst extension to Fortran you've ever
come across?

My personal (dis)favorite was the AT statement in a Siemens/Fujitsu
compiler, for debugging purposes. It actually implemented the
infamous "come from" statement, and it also introduced different
behavior when debugging.

Code like

10 A = I+3
20 B = I+5
DEBUG
AT 10
IF (I.LT.4) I=42
GOTO 20
END

would, when debugging was turned on, magically yank control flow
away at the statement label 10, change the value of I and then
jump back.

Urgh.

Anything worse?
.

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