#3 Return to challenge Brock Lesnar for WrestleMania - RAW 2/24/2014

On Feb 24th, 2014 episode of Monday Night RAW, Paul Heyman announced that his client, Brock Lesnar, would not be competing at WrestleMania XXX. He wasn’t handed a title shot at the WWE World Heavyweight Championship becauase that distinction goes annually to the winner of the Royal Rumble. Heyman stated that any match other than one for WWE's top championship wasn’t good enough for his client.
As the men decided to walk out of the ring (and supposedly WWE), The Undertaker’s signature gong hit followed by himself walking to the ring. Heyman was eventually overjoyed by the prospect of his client getting the opportunity to break Undertaker's vaunted undefeated streak at WrestleMania, which at the time stood at 21-0. Brock Lesnar signed the contract and pointed the pen towards The Deadman. Instead of just signing the contract, Undertaker pierced the pen on Lesnar’s hand and chokeslammed him through the table, followed by signing in Lesnar's own lifeblood.
The Undertaker’s undefeated streak was broken that year at WrestleMania XXX by Lesnar, which is still considered possibly the most shocking moment in the history of WWE.