1923 "not!"

[jester at PANIX.COM]

It hardly needs stating by now that the interjectional postmodifier
"not!" was common early in this century, but I thought I'd throw
yet another one out there:

1923 E. Lefevre Reminiscences of a Stock Operator 53
My relations with my brokers were friendly enough. Their accounts
and records did not always agree with mine, and the differences
uniformly happened against me. Curious coincidence--not!

Jesse Sheidlower
Oxford English Dictionary
<jester at panix.com>