There's a lot of champions if you're looking for general confusion:
I'm over here! No wait, I'm over here! Oh, you're ganking me? I'm back here now!
I'm hiding in my W. Or am I? It's cool I'll chunk you a bit and go back to hiding. Nom.
Do the Shurima Shuffle! queue music Also, I have another turret just in case you kill mine. It also works on yours. Hah!
Dives you from half a screen away, takes 70% of your health, bends space time and goes back to safety while healing himself and doing damage. Ok.
Wards are useless. You spent 75g on that juicy Pink Control Ward? I'll just kill it and come back then...
You belong in a Museum. Seriously though he's incredibly annoying being able to be in the fray while being able to E away to safety.
Press E and watch the enemy team get tilted into oblivion. Also, bonus points for finishing someone with your R and swag-walking away.
THOU SHALT NOT GANK MY ADC!!!
Half your health from a whole screen away? SeemsGood.
Oh, you just worked so hard to pick up that juicy kill and survived by the skin of your teeth? J/k. Also, kill me I'll still fight you.
If you're cunning enough, the enemy team will have an aneurysm trying to chase you down. Also jumping in and killing a squishy and jumping back out is infuriating.
Press R -> We're fighting. NOW.
You're not moving. Ever.
Point-and-click tilt.
I found your ADC. They'll respawn soon.
I'll trade you mana for HP and HP for mana and mana for HP and....
Enemy team is already tilted from champion select, their ADC likely already is working on insults.
Shrooms. Everywhere.
Similar to jayce. Poke the enemy team from Fog of War for maximum effect.
Team-wide imprisonment. He also hurts and scales to infinity and beyond.
The walking artillery turret.
If you have the mechanics and luck on your side, 1v9 the game. If not, 0/10. Lots of people hate him. His Wind Wall will tilt any line-based ultimate champion to death.
Gank mid from Red/Blue. Proceed to watch the enemy mid laner sit under their tower. Then dive them there.
Where am I ending up again? It's cool, neither my opponent nor myself knows. I have the element of surprise. Also R and button mash for free kills on squishies.
RIP Towers.
CHRONOSHIFT BABY!!!!!!!
My plants will take half your health while I'm safe under my tower. They also out-range a lot of ADC's, leading to heavy tilt and nigh impossible sieging on her.
I'm sure there's many others, lots of champions have their own little niche in regards to trickery, however some are straightforward (like Pantheon) and are very easy to cause panic among the enemy team. Hope it helps, best of luck to you!