Viewers and news outlets were quick to notice a very brief nip slip during a water polo match between the USA and Spain.
Underwater cameras caught American player Kamie Craig pull down on a Spaniard's swimsuit, briefly exposing her breast.
Most of NBC's Olympics coverage is taped and edited for broadcast, but the match was part of a live telecast.
Several viewers uploaded the incident on YouTube after noticing the nipple flash, with the use of DVRs making it much easier for audiences to instantly see a replay on an unexpected moment.
Although the game was aired live, the network has been criticised for not using a delay system in order to quickly edit such incidents if they occur, reports Examiner.
The game ended in a 9-9 tie, with Kamie Craig scoring four of Team USA's goals.