Mine was watching Graham Gooch score 333

For me there are so many:

Seeing Harmiston bowl to a 9 slip cordon in the West Indies.
Graham Thorpe leading England to test victory in the pitch black in Pakistan.
The 1999 Semi where Donald and Klusner mucked it up and the Aussies somehow won
Michael Atherton defying Allan Donald at Old Trafford a few years back...

So many great memories!

Anytime watching Ambrose and Walsh when they were really steaming in and had a hard bouncy wicket. This two must still give nightmares.