When antiparticles meet their match in our universe, it's even more spectacular than when Jet Li does it. Both are annihilated, converted entirely into high energy blasts that can punch through almost anything. (Also like when Jet Li does it.) Note that even scientists, who refer to earthquakes and tidal waves as "events," use the verb "annihilate." Antimatter science makes Daleks sound understated.
EX-CUUUUZE ME, WE FIND SY-NAJ LESS GRAY-TING THAN OUR VOY-SEZ!
So what did science do with the kamikazes of particle physics? Played quantum Lego! They took the self-destruct switches of the Standard Model and built bigger things out of them. Early experiments at CERN created antihydrogen -- the first full anti-atom -- over 15 years ago, but because the antimatter was created at almost the speed of light, it exploded things far too fast to study. Notice how even science's problems sound more awesome than every other field's successes.
Curses, we accidentally demonstrated our mastery of mass-energy conversion. Again.