Both of those bullfighting tasks use adolescent bulls, but that wasn't precaution enough.
How about the couple's yoga task in TAR Canada 3 where Sean almost broke his neck?
In TAR Latin America 3, on the penultimate leg, there was a task that involved extracting juice from inside of fresh coconuts on a beach in Brazil. Only one of the teams took this task (The Mexican couple). But this task involved holding the coconut in one hand and swinging a massive, sharp machete with the other to cut into the coconut. I cringed and looked away every single time he swung the blade. Just a few inches off, and he would have lost a finger.