Crossfit's "Murph" workout, in honor of LT Michael Murphy is:
1 mile
100 pullups
200 pushups
300 squats
1 mile
Obviously most people can't do 100 consecutive pullups, but the idea is to knock them out as quickly as possible.
Don't forget to wear a 20 lbs flak jacket if you have one available.
Did this workout (sans 20 lbs flak jacket), it is just as brutal as it looks. Did it with 10 sets of 10 pullups, 20 pushups, 30 squats.
Edit: I am glad someone else posted this, because when I read that post I immediately thought of this workout as well.