I copied the code and put it on a page on my website here:
http://www.rugbyamericaproductions.com/Youtubehijack.html
Same thing happened on one machine only:
Machine Model: Power Mac G4
CPU Type: PowerPC G4 (2.1)
Number Of CPUs: 2
CPU Speed: 1 GHz
L2 Cache (per CPU): 256 KB
L3 Cache (per CPU): 2 MB
Memory: 1 GB
OSX 10.39
L.O.A.