I've a few random ones:-
GAB 2004 Taker buries Bearer in cement.
As someone mentioned earlier, Paul Bearer has stabbed Taker in the back more times than most of us care to remember. Only once however, has the Deadman stabbed Paul Bearer in the back. It's 2004, Taker's been back as The Deadman for little over 3 or 4 months. He's crushed Kane, beaten Booker and now he's being pestered by Paul Heyman and the Dudley Boyz in an attempt to force Taker to work as Heyman's lackey.
How do they do this? By kidnapping Paul Bearer and threatening to bury him alive in cement if Taker refuses to lay down for the Dudleyz in the main event.
Sufficed to say, Taker squashed the Dudleyz and chased Heyman away before he could carry out his threat...... ONLY FOR TAKER TO RELEASE THE CEMENT ANYWAY! Taker justified this by telling Paul that he couldn't afford to have to keep looking out for him all the time, so he'd just take him out himself right there and then.
Paul Heyman betrays Lesnar at SSeries 02
Remember the months and months of Paul Heyman drilling everyone's minds with the thought that Brock Lesnar was The Next Big Thing in wrestling? Remember how Paul was always there at Brock's side, encouraging him to dish out the beatdowns? Remember when Big Show threw Lesnar through the stage and Heyman spent a month telling Lesnar NOT to defend the title against Show?
It's Survivor Series 2002. Big Show vs Brock Lesnar w/ Heyman for the WWE Title. For weeks Heyman has been telling Lesnar that if he faces the Big Show, he will lose the WWE title, because Show is too much for the champion to handle. Match starts, bit of back and forth action, and suddenly Brock begins to dominate, even hitting Show with the F5. The crowd is in shocked awe at the sight, and just as Lesnar goes to make the pin, HEYMAN BLASTS HIM WITH A CHAIR! Lesnar chases Heyman around the ring, slides back in, and gets chokeslammed on the same chair for his troubles, 1, 2, 3 new champion and the crowd is stunned at the betrayal they just witnessed.
I don't think anyone assumed Paul was saying 'If you face Big Show, you will lose the title..... because I will screw you out of it regardless.'
The Hardyz attack Michael Hayes in 1999
I don't even remember the specific details of what happened here, but basically when the Hardyz debuted as a tag team, Michael hayes was their manager. The former Freebird would come down with his cane and watch Team Extreme do it's thing, even tagging alongside them at least once against the Acolytes (where Hayes received a forceful double powerbomb for his troubles and was pinned).
Around the same sort of time, Edge and Christian had decided that they'd had enough of Gangrel telling them what to do, and had decided to split the Brood.
After losing the tag titles to the Acolytes and a number of other losses immediately after, the Hardyz decided to ditch their manager and join...... you guessed it, GANGREL, in order to from the New Brood!
Nothing super amazing about the betrayal, except obviously it kick started the E+C/Hardyz fued that would go on throughout 2000 and 2001, all because of one tag team leaving a stable and another joining it.