Type 'Do a Barrel Roll' into Google

[Rich O Brien]

If you type Do a barrel roll into Google, return and wait......#

Now try Tilt

[solo]

Only works with Chrome.

[Rich O Brien]

Look at the centre of this picture, don't blink and it will disappear

[Alan Fraser]

It'll work with Firefox too; but you need to use the Google search bar or be on the iGoogle page.
Askew works the same as Tilt.