stab him in the face with a sodering iron

or an ironing sod

WAIT

don't do a run in, do a run out. In the middle of one of your matches go tot he back and grab some guy you don't like and beat him up, return to the ring and then win the match. That will get you double over

A memory came to mind tonight at the bar...

HBK was feuding with Rick Martel. Rick Martel had a match with Bret Hart for the IC title. Martel had Hart in the boston crab by the ropes, and HBK comes out and punches Bret a few times right in front of the ref. Martel thinks he won, and flips out when they announce Bret Hart as the winner.
I know someone else said "Cause the othe guy to get a DQ victory" but this is just an example of how that can happen.

Want some idea’s?

Don’t ask a wrestling forum what to do.

Dave Youelli is a big jerk. Don't listen to him

also shoot your opponent with a crossbow

bring out a sign that says "God Hates Run Ins" and don't do one.

walk out slowly, climb into the ring, and punch him in the face and yell "Bitch!!"

Set up a wall with some small pyro, then at a big momenet in the match make your entrance by smashing through the wall. What you do from there is up to you.

During said match come out in a tshirt that has your rivals name on it. Cheer him, make it seem so real. Then after the match is over take off your (first try to rip it, but when that fails simply pull it over your head) shirt and reveal a smeared by sweat version of your own ring name written with sharpie on your chest.

then exclaim "hahahahhahahahahaha" but don't do anything

make sure you laugh past the point where it is annoying though otherwise you won't get any heat.