This is my present for Photoshop 20th anniversary: a video made with Photoshop 1.0.7!!!
(Yes, I was able to run Photoshop 1.0.7 on Mac System 6.0.8, emulated via Mini vMac :-)

★ VIDEO, concept, recording and montage: Giovanni Antico, aka GAntico
♫ MUSIC, licensed from iStockphoto®, © Mirkic, Very happy piano/cello composition.

Some still screen-shots in my blog: gantico.com/en/2010/02/photoshop-20th-anniversary/

Update1:
Lot of thanks to Adobe and to John Nack for mentioning this video in his blog: tinyurl.com/yzjhpdo

Update2:
Thanks to Adobe also for having screened it on the big screen at Adobe Max 2010 in Los Angeles.

PS
Check out also other tributes to Photoshop, appearing in these videos made of human pixels:
performance #1: vimeo.com/4987583 / performance #2: vimeo.com/5493457