Now that One for all is rolling in time to talk about the funner one for all champs to pick...
I'd appreciate it if people were to comment below some other fun champs to pick for one for all as i have shared this champ with you so we can all have fun together!
So when i logged in one day a few months or so ago and saw that riot had released one for all again and was instantly happy so i get into my first one for all game for the week and i don't know who to pick and then a wild idea happened in my head instead of thinking about a champion who will rek the enemy i thought of champions who will be fun to play! and thus i picked... Sion. Everyone else picked something else and nobody agreed on one person amazingly it was mine that was picked... thus followed us discovering they picked bard... and thus followed the most funnest and irritating match i have ever played. P:S it was only irritating because some guy was toxic the whole match and kept hating on the sion pick and was ripping on me which sucked was very weird though because he still kept yelling at me when even HIMSELF was doing good so i don't know what was wrong with that guy but anyyyywayss the other reason it was irritating is because who we were against... So sion is a tank right?... well... team fights lasted about 5-10 minutes each... because map control bard.. and tank sion... they couldn't kill us... we couldn't catch them to kill them... it was... so annoying.. just imagine a sion chasing a bard.. bard uses portal... sion follows through portal... bard q's... sion is stunned... sion is un-stunned... chase continues.... bard uses portal.... sion follows through portal... bard q's..... sion is stunned.... sion is un-stunned... chase continues... annoying AM I RIGHT?! XD 
best one for all i've ever had... Hope you guys have fun from choosing sion and leave me some fun one for alls to do so i can have fun with my friends :p
huehuehuehuehuehuehuehuehuehuehuehue c:
BALLS EVERYWHEREEEE!!! (yes, you can use eachother's balls too kek)
Last time i tried it you can activate eachothers spears.
and 
One E lands, everyone spams Q, RIP. Also the whole enemy team does 15% less damage to you all game, which is nice.
People complain about Morg's snare lasting for hours, well now it actually can! Not to mention the constant spell immunity.
Speaking of never-ending cc.........also, 5 ults in the same area basically guarantees any teamfight is won.
The W trolling almost beats Bard in terms of hilarity. You can also conceal your entire team inside one Kench's belly, which can make for some awesome ambushes.
Speaks for itself I think. 1 Shaco is annoying enough, but 5? Ragequits will definitely ensue. Clone baits, box stacking, Deceive jukes, assassinations everywhere, just total chaos lol.