PSA: Read the patch notes!
I can't tell you how many times I've seen people go for dragon when their mid towers are free. If you get towers, your minions push harder for you (that's a bit OP). Not to mention the map control we get.
I can't tell you how many times I've seen someone play a champion then refuse to stack (I.e. Kindred/Viegar) simply because they refused to read the patch notes/ability description to see what it does.
I can't tell you how many times people think they can counter jungle a skarner when they know he is alive because "He doesn't do enough damage to kill me".
It pains me to see that people are learning the hard way about new things rather than READING SOMETHING THAT WILL TAKE 5 MINUTES OF THEIR LIFE.
That is all.