#2 Brock Lesnar breaking the streak
The Undertaker's WrestleMania winning streak was probably the best example of WWE's long-term storytelling. When we stepped into the 2010s, the Deadman had won all 17 of his WrestleMania bouts.
In 2010, Shawn Michaels challenged The Undertaker for the second year in a row, this time in a streak vs. career match, in arguably the best match of the year. In the successive two years, it was Triple H's turn to give us two brutal and brilliant WrestleMania duels with the Undertaker. In 2013, CM Punk lost to The Undertaker at WrestleMania, marking the 21st and last win in the Deadman's famous streak.
In 2014, at WrestleMania XXX, Brock Lesnar hit the F5 The Undertaker for the third time in the night to get a pinfall victory - hence ending Undertaker's legendary streak.
The match was a disappointing affair - owing to the Deadman suffering an unfortunate concussion early on in the match. However, the matter that agitates the fans even to this day is the fact that WWE, in the opinion of many, wasted such a legendary moment on someone like Brock Lesnar, who does not seem to care about the business, and didn't gain anything from the accolade. WWE could have used that win to bolster someone else but instead gave it to Lesnar - someone who was already well established in the company.