Ehh, I spend a lot of time on pokemon, but if I lose a game, even under the most ridiculous measures, as long as my opponent wasn't a jerk, I'm fine with it.
Although I have been really frustrated with one single game.
It's nationals. I'm playing Gengar C with some strange techs. After starting 4-0 then being donked twice, and getting a terrible hand in the next round (I had to use mimic 6 times, including twice in the middle of the game. I have no idea how the chatot survived that long) I know I have to win the next game to top cut. I have good resistence and an extremely consistent list. I sit down, and my opponent brags to me about how he won a states. Maybe to intimidate me? Well I just beat a regional champion and a state champion, so I guess this shouldn't be too hard. He flip shaymin UL active and hoppip benched. So I have a favorable matchup but a mehh start. I flip over 2 baltoys. He goes first and does nothing. I topdeck rare candy which I use to candy into claydol, use rosies for a gastly and psychic, cosmic, I get a bts and lux ball, luxball for the second claydol, plat warp point, cosmic power for communication, candy, dragonite fb. Get a gengar out and kill the hoppip for my first prize. Amazing. Good matchup, and a terrific start. He does some stuff, gets a jumpluff out, hits me for some damage. I snipe his shaymin. Fainting spell... heads! 3-5 my lead, and I'm set up to win. I haven't played any cards this turn, and the supporter as the last cardin my discard pile proves it. I bring up garchomp c which has a dce and energy gain on it, level up, cosmic power my 2 card hand for a 6 card one. He waits for me to finish drawing my cads, then his hand immediatly shoots up. He tells the judge that I used cosmic power 3 times with only 2 dols in play. Me, being stupid enough to remember that I can ask for head judge, try and argue, but the judge rules in my opponent's favor and he gets 2 prizes for a penalty. Then he takes my 6 card hand and bottoms it. So I have a 0 card hand and it's 3-3... I snipe his dol to make it 2-3. I get poketurn from my prizes (I remember this because it's really crucial to the game.) He night maintences his hoppip, jumpluff,energy back then knocks out my chomp, I send up a bat use comic twice, bebe's for a gengar (He accuses me of putting two cards back with bebe's, but since this kid's not even letting me use cosmic power, how would that help me?) I poltergeist his jumpluff, and I'm lucky enough to hit 3 trainers. 1-2. He needs to move some energy around because of a mispay he made, so he drops shaymin! That means it's game next turn unless he can knockout both my gengars this turn. He checks his discard pile and calls over a judge. I have 1 prize left and there are only 4 pokemon in the discard pile. The judge doesn't even check to verify and takes the poketurn in my hand that was going to win me the game, and puts it in my prizes! Then he gives my opponent another prize card. Another judge walks over and tells me to slow down because I'm making several misplays. That one comment is actually what made me sour about this situation. He warp points around my gengar x, my whole bench is vunerable to mass attack, so I just shake his hand and sigh. He starts takling about how he's so syked to be making topcut, and I wish him luck. He's gonna need it with all the judges watching his matches
He then offers to go up to the league play place where you can get prizes by beating people, and says that he'll tell them that he lost to me in league play to make me feel better. I tell him I'll meet him there, and talk to friends for the next 20 minutes whille he wonders where the heck I am.
Much muchlater, I find out that he made top 8, and gets to go to hawaii. Wow.
That, has probably been the only experience in pokemon that has really frustrated me. As for making opponent's cry, I don't think I ever have.
EDIT: Holy crap, this is a long post!