Bad Leashes
They really really suck.
And they can lead to losing games IMHO.
Picture this: Your leash is so bad it gets stolen, for awhile, u are still a level 1-2 and everyone else is level 6-7
Your leash is so bad that they leave, and you next 3 attempts you get killed by camps.
and for the rest of the game your jungler is unable to gank or be useful because of one bad leash. This has a huge impact. You may even want to have the first few camps be leashes.
But please, no matter what, don't give bad leashes
. I've discovered a few of things.