Post something that almost everyone forgets nowadays from the past.

Mine: Gentleman Cho originally had a cigar when released, but was shortly changed to the pipe we all see him have now.

Irelia's concept art originally did not have a ribcage.

The current "spine broken" crowd would've lost their minds.

Karma.

pantheon/twisted fate's ults were global

Before Varus, champs had 2 skins on release. Also, champs were free 2 weeks after they were released, not 3. Thirdly, champ rotation used to happen on mondays, not tuesday.

eve could stun

Bloodrazors used to stack.

Alistar used to have 1:1 ratios on both pulverize and headbutt (ditto sion for Gaze/Shield).

Cleanse used to counter Warwick.

TF's ult used to be a global slow, the teleport was his E (and on a 20 second cooldown).

The "meta" largely consisted of doing whatever (and then losing to Sion/Taric botlane)

The original sounds for LoL was some dude saying "ownage" when someone was on a kill streak or something. This was in the closed beta.

Would be funny if they added an option for those sounds to be turned on now.

EDIT: Also...,
- Sunfires used to stack
- Ryze used to have a move that gave him Autoattack damage based off of AP(or mana. I forget) so he could out dps AD carries and out nuke AP carries
- I'm pretty sure there was no matchmaking either. I remember having to join every game like you do custom games now
- Kat's skin where she had blue/green hair was her original skin

You call that "old"??

Blitz's arm grab wasn't a skill shot, if you had sight you clicked on the champion and pulled them.
Janna's shield's buff (increased AD) was affected by AP.