Most Impressive Burn

It was my second season of commuting to work by bike about 4 - 5 km a day for six days a week.

In November 2013 I managed 37 km mountain biking in the Peak District. The first section was with rucksacks as we transferred our luggage between Youth Hostels. It left me without any energy and the last 3 km I was too sore to sit and had to push the bike back to the hostel. It took 5h45m but burned 4488 Cal. What's your biggest burn, inspirational achievement or claim to fame?

The ride my partner and I managed last year. http://www.mapmyride.com/workout/423049745