Simple yet very challenging:

Bodyweight Bench/Push-up Countdown

For time:
10 reps BW Bench Press (175lbs)
10 push-ups
9 reps BW Bench Press
9 push-ups
… Down to 1 rep each.

Total Time: 9:58
** Dropped the bench press to 155 starting on the round of 6 reps so that I would be able to get through this in 10 min.

Video