1996.
Schumacher got away with tapping one of the stacks but I don't see how this was ironic.
No, it was later than that.
I've got it now.
Hill and Villeneuve along with Berger were involved in deciding placing tyres on the chicance and it was these tyres that were Hill and Villeneuve's dowfall. There your irony right there!
That is an excellent answer, although not the one I was after.
I'm going to reword it.
* The picture above shows the first chicane BEFORE it got reprofiled.
* Which year was the first chicane (and also VERY SLIGHTLY) the second chicane re-profiled (to its current format) to reduce accidents?
* What was terribly ironic about the race, that year?