Two things, the second linguistic, the first not

[lola_granola]

1) While driving home from the Jacksonville airport today, I saw two separate pickup trucks (not traveling together) sporting the same bumper sticker: a waving American flag covered with the words

Comments

I have heard it for a very long time

[anonymous]

... and until your post, never realized it's grammatical weirdness.

But check this out on Language Log, where Geoff Pullum proposes an explanation:

http://itre.cis.upenn.edu/~myl/languagelog/archives/002690.html

---Andrew

Re: I have heard it for a very long time

[lola_granola]

Thanks!