The Doorknob Drop is an obstacle, firstly introduced as the fifth obstacle on American Ninja Warrior 10 in Los Angeles.
It featured 2 boomerang-shaped boards, with the second half of the first board facing each other with the first half of the second board. Each board contained a different number of doorknobs. The first board was symmetrical, while the second board had its first half much shorter than its second half.
Competitors must climb up a rope to reach the first board. Then, they must use their upper-body to traverse the first board's doorknobs (in a similar fashion with the Doorknob Arch). After that, they must make the transition to the second board by turning their body around, then traversed the second board's doorknobs, and finally made the dismount to the landing platform. When the competitors made the transition from the first half to the second half of each board, it would tilt in favor of their weight. Also, several doorknobs were stationary, while others would rotate when the competitors grabbed on them (similar to the Doorknob Grasper).
During Los Angeles qualifiers, the obstacle was proven to be brutal, as it took out many top competitors, including Flip Rodriguez, Kevin Bull, Grant McCartney, Gabe Hurtado, Tiana Webberley and Zhanique Lovett. Only 10 competitors were able to complete the obstacle.
The Doorknob Drop was attempted early during Celebrity Ninja Warrior: Red Nose Day 2. However, the number of doorknobs was reduced to 22 (13 doorknobs on the first board and 9 doorknobs on the second board), and the doorknobs were more peg-like and stationary. Among the 5 celebrity competitors who attempted the obstacle, only Derek Hough failed to complete it.