Lines you made up -- that have been said before

There are lines that I made up and have used for years and years, but which later I found out that someone else had also made them up. For example:
[ul][li]I’ll burn that bridge when I come to it.[/li][li](In response to ‘You’re funny.’) Yeah. But looks aren’t everything![/ul][/li]I’ve been using those lines forever. But I’ve since heard the former several places. I was watching Taxi Driver the other day and Harvey Keitel said, ‘You’re a funny guy. But looks aren’t everything.’

So what lines have you come up with out of your own head, only to find they’ve already been said?

A friend of mine came up with the line “This sentence is a lie” but found it quoted by people born a few decades before he was born. I still thought it was a clever little paradox to come up with.

I always say, “That throws a monkey in the wrench.” And then I heard it on Die Hard. They copied meee!

I used to explain most Jewish holidays as:
“They tried to kill us. They failed. So, let’s eat”.

I was terribly proud of myself until I saw it written a bunch of places, most notably here on a recent SDMB thread about Purim.

Well not an original line, but basically accurate.

Then, of course, was the time I discovered someone else had said “Ask not what your country can do for you…”

How embarassing! :wink:

As a teen, I thought I was very clever for inventing the acronym SO. It may have been seeing it here on the boards that I realized I wasn’t so clever, but I’m not sure when I realized I wasn’t the first person to have thought of that.