The year is 1984. It rained so heavily on race day that the drivers complained it would be unsafe to speed through a dry tunnel and then emerge onto a soaking wet track. So the organisers flooded the tunnel(!) using fire hoses. That took them a little too long which delayed the race.
[youtube]http://www.youtube.com/watch?v=naxmkNmtrT8[/youtube]
Btw this is the very same race that saw Senna and Bellof storming through the field only to be stopped by a premature checkered flag.

I haven't got a good question at the moment. So I open up the thread to anyone who does...