Bronze League in a nutshell.
TL;DR
No matter how hard you carry. You will surely die.
You may be 10-0 but 1-2 allies will feed to death causing enemies to wander in your perfect lane and make you 10-7 in minutes.
The Adc is never good and if they are you won the lottery.
Impossible to get in a game without champ select being full of players cursing each other out.
You will make the best plays and get a triple or quad but still get wrecked by the feeding.
1 player is afk.
1 player rages because he/she doesn't know how to farm under tower.
1v5's.
1v5's
or
lane splits and kills your turrets.
Jungle can't smite before the dragon has 1000hp.
Jungle can't jungle.
Adc can't adc.
can't 
The player that gets pissed at the other players who feed is coincidentally the best player on the team. (The poor guy who got stuck in Bronze.)
jumps
and jumps
and jumps
then splits
then melts everyone.
Adc blames support because Adc cannot kill.
6-0 Adc stands in front of the entire team in team fights. Proceeds to go 6-9 after 20 more minutes.
Adc is the team fight.
Adc farms jungle during every team fight.
Adc is solo fighting
.
Troll has to troll your promo.
Player picks a new champion to play in a ranked game.
24-4
is 1v5ing. (and winning)
Player walks ahead of minions and gets melted by inhibitor turret.
4 members of the team try to baron with all 5 enemies alive.
Team tries to kill max hp enemies that have a newly acquired baron buff.
Player stands under 1hp turret against 5 enemies.
Player picks adc for top lane.
Tank charges 5 enemies with nobody around.
fights
and can't figure out they aren't going to kill 
Mid or feed
Platinum smurf isn't Platinum.
Actual Platinum smurf can't carry awful team.
Welcome to Bronze. Enjoy.