Stop giving them Taric/Nunu/Sona/Karma/Soraka/etc.

Especially stop giving them Eve, Nami or Janna. And stop being clever and giving them all supports.

Do give them:

• Five of the same kind of champion, even if you have to give them high tier ones.
• A team with no mobility.
• A team with no CC.
• Champions with hard counters (Morde, GP, MF) especially if your team already has those hard counters.
• Champions they probably can't play, ie weird or low pickrate ones. It is a safe bet that no one has a clue how to play Galio, Elise, Morde or Anivia, and people seem unable to build TF properly. Viktor is also hard to use but is riskier because he shows up enough in nemesis draft to give people a chance to learn how to aim death ray. Urgot is a gamble because most people may suck with him but if they don't, your rickety non-meta lane is going to get dumped on.

Don't give them:

• Shit tier champions for the sake of giving them shit tier champions. The five lowest winrate champions actually form a nice meta team. If you give them troll picks, they are slightly more likely to lose. If you give them a lineup that can't lane or teamfight while yours can, they are guaranteed to lose.
• Champions that hard counter something (Janna, Darius, Sona, Yorick) because the rest of your team will miraculously consist exclusively of the exact champions that get hard countered.
• An all support team because "xD". They will ban or donate enough squishy supports to prevent you from giving them nothing but squishy supports, and then you will stick to your gimmick and give them Alistar and Braum and then you will lose.
• Eve if you don't trust your team not to feed her.
• Shaco. DO NOT UNDER ANY CIRCUMSTANCES GIVE THEM SHACO. You're playing Russian roulette and pulling the trigger five times.
• Janna if the intention is to give them five squishies. Janna exists for the sole purpose of protecting squishies.
• Champions that are actually decent, just because for some reason everyone bans them (Nami, Eve, Janna, Aatrox). I have no idea why people keep giving each other Janna.

Don't ban:

• Common bans which your team is actually good with. If you have a Taric main on your team, don't ban Taric and wait for them to donate him. The bait may be obvious, but it is a good bet that at least one of the enemies is oblivious enough to fall for it.

Also:

• Don't flame the guy who picked the enemy champion that's currently wafflestomping you.
• Try swapping top and bot if you got countered, if they don't have a jungler or just for the hell of it to mess with them.
• When someone says he absolutely can't play a champion and offers a trade, don't tell him "stfu" and then report him for feeding.