I would give it a close tie between the following 3 head banging moments.
1. (The head shaped crater on my desk)
- 2 Gold matches and 1 Platinum, played to wave 10, 11, and 10 completing the objectives for the $$. Disconnected and "EA servers are not available at this time." on restart for about 2-3 minutes after. Over an hour of play for no $$. I didn't play for almost a week after that.
2. (Woke the neighbors.)
Hosted 4 U/U/G matches
- Match 1: FBWGG
- Match 2: FBWGG!
- Match 3: FBGGG )(yay, new map, still f***g GETH!)
- Match 4: (drumroll) ... FBWGG!!!!!!
And yes, I checked my settings after each game. Unknown enemy, Unknown map, Gold. After the fourth game I called it a day and washed dishes. That was about as much fun as playing against Geth AGAIN.
3. (Wish my headset was working.)
Joined a U/U/G match with my Justicar + Eagle I power max loadout. Game starts at FB Dagger with... Geth.

Wave 1 starts and the host runs right at a spawn and dies in about 5 seconds. He leaves and the wave restarts. The new host runs into a spawn and dies, just as the old host re-joins. Current host leaves, wave restarts. 1st host is made host again, runs out and dies after about 15 seconds this time, leaves tha game AGAIN. We restart WAVE 1 for the 3rd time! Immediately after restart, one of the 2 remaining players leaves, so just me and one other guy left.
Other guy runs down the hall and dies after a few seconds, he quits the game just as I'm reviving him. Restart freaking wave 1 for the FOURTH TIME! Ended up soloing against Geth with a Justicar and an Eagle I. After about 44 minutes of torture and grind, I complete the last of the 1,2,3,4 objectives on wave 10 and start mopping up. An invulnerable Hunter gets stuck on low cover corner. Cobra cant kill him, BE's won't budge him, can't quit and restart, cant self kill, gave up after about 5 mins of trying and got nothing for the whole nightmare.
Every time I buy 1,000,000 credits worth of PSP's and Vet packs and get junk class cards and upgrades to weapons that blow (yay. another locust... and my 6th consecutive turian soldier! Yay me.) I wonder why I keep playing. But it's those few really good games with a fun group that make it worth the pain.