He got it from the credits at the end of the movie. He apparently thought that was the song that was playing.

"Blame it on the Bossa Nova" performed by Don "No Soul" Simmons (David Alan Grier) during the credits of Amazon Women on the Moon

This is the first one that popped into my mind too.

All of the music in Almost Famous works so well, including Led Zeppelin's Tangerine at the end.

As corny as it sounds...You've Got Mail with Over the Rainbow....

'Don't ya just know it' - Snatch

i loved the "Build Me Up Buttercup" video at the end of TSAM.

I liked The Who's "Baba O'Riley" at the end of The Girl Next Door too.

Ah, yeah that's a good one!
I can't think of any of my own.

While perusing my movies for something to watch, I found another one I'd forgotten about that I always liked. May seem kind of dumb, but...

Jason Robards and Corey Feldman dancing/lip-synching to the duet of Mel Torme and Mickey Thomas singing "Dream A Little Dream Of Me" during the end credits of the movie of the same name.

I love the End Credits for LOTR: Return of the King

I also love the ending song for The Bourne Identity & The Bourne Supremacy.....I forget what song that is

This song is used a lot! I remember it also at the end of 50 First Dates and Finding Forrester.

Frou Frou's "Let go" near the ending of Garden State...gave me chills.

Things Have Changed - Bob Dylan ("Wonderboys")
God Only Knows - The Beach Boys ("Love Actually")

how about "save me" at the end of magnolia.

Rypro, that's the best example yet.

To add another one from '99, how about Because, at the end of American Beauty.

Build Me Up Buttercup was the first thing that popped into my head. In fact, it is one of the few songs I actually remember that played during the credits. I'm sure the accompanying video has something to do with that.

Lyle Lovett's cover of "Stand by Your Man" at the end of The Crying Game

Sammy Davis Jr.'s cover of "Mr. Bojangles" at the end of American Movie

Johnny Rotten's cover of "My Way" at the end of Goodfellas

Fiona Apple's cover of "Across the Universe" at the end of Pleasantville

"Extreme Ways" by Moby. I was literally smiling ear-to-ear when they played it at the end of "Supremacy". Didn't think they'd use the same song (heck, they didn't even use the same director), but was glad they did.

About "American Beauty", I was suprised to find out that was the late Elliott Smith that performed it, since it sounds so similar to the "unplugged" version on Anthology 3. But I guess The Beatles never let people use their tracks on soundtracks.

"You're the One", Shane MacGowan's duet with Maire Brennan in Circle of Friends.

Which reminds me...Saffron Burrows...

"Sweet Home Alabama" - Con Air
"Back To The House That Love Built" - Desperado
"Malaguena Salerosa" - Kill Bill Vol. 2
"Mighty Wings" - Top Gun
"Where Is My Mind" - Fight Club
"Rock is Dead" - The Matrix

"Put a Little Love in Your Heart" in Scrooged
"A Whole New World" inAladdin
"Beauty and the Beast" in Beauty and the Beast

No dumb at all. Actually the best part of the movie!

Jim Carroll's "People Who Died" at the end of "Dawn of the Dead" (2004) kicked ass.

The Beach Boys' All Summer Long from American Graffiti

I echo the other for Look On The Bright Side Of Life (all Things Dull and Ugly).

Meaning of Life brings a smile to my face too.