This is where i'm going to put some normal stuff i found in the toilet.

You (with no jetpack)
This literally changes nothing about your character.


Rubbish
If you put any misc item into the toilet (including guns, wearable hats/heads, trash and mail)
it doubles in size, i have an example with a coke. croak can.

Before:


After:


People
if you put a person in the toilet, you can have a bit of fun, as they get completely terrorised by whatever magic the toilet beholds.

Before:


After

Jetpack:
Time to have a bit of fun. If you hop into the toilet whilst wearing a jetpack, it becomes a balloon pack (reversable by going back into the toilet) this also unlocks the balloon pack as a backpack item in the edit character area. Balloons can be popped with the stand-up button, but that sometimes doesn't work, so you just have to wait for them to pop by themselves:

Before:


After:


This can become a little bit overpowered though, as you can fly across the map as long as you get enough height and speed (which also makes it very useful when costume hunting!) :

Before Balloons Pop:


After Balloons Pop:


The Grapple Gun:
When you put the grapple gun into the toilet, it becomes a balloon gun, which shoots balloons at will:

Before:


After + Preview:



Cars:
If a car is put through the toilet, it becomes much smaller, but you can still drive them! I think they look so cool. (You will want to use the grapple gun to get these into the toilet, as the cars are very hard to get in using any other way!)

Before:


After:



Mistake:
Sometimes, the toilet doesnt work like you thought it would, and an item might revert to being small/large instead of changing, or explode on the off chance that it is a car that goes through upside down, be careful!

Mars Rover In Swindon:
If you search hard enough around in swindon, you might've found a toy car near a bin (which is worth 20 points, may i add) or, if you are very perceptive, the toy mars rover. If you have seen either of these things, they can both go through the toilet and be fully functional (although, in my search, i couldn't find another toy car for the life of me).

Before + Mars Rover Toy Location:


*This is found on top of the swindon town hall, on the left side.

After + Driving:




Now go, unclog the toilet and have some fun! I sure did.

Update:
Whilst trying to get a car in the car park, i found a truck with "frog park" written on the side (the exact same as the big container next to the huge cat), this truck can be made drivable by putting it into the toilet, like with the Mars Rover. There is a drunk donald trump next to the same garage and, by putting him in the toilet, you get a sad variant of the poop head.

Statue of Froggerty:
There is a buried statue of liberty froggerty that has a lab inside of it's mouth (and a cookie down it's throat) which is to the top of the map (past the ocean, on another island. The lab inside of it's mouth includes a cage with a camera. This statue can be clipped through if you hit it with enough speed, i found that out after using the balloon-pak trick, where you fly high for speed.

Statue of Froggerty (Map is out of range near it):


Inside:






Credit To {FTW} Chicken Scout

Chicken scout has said that, if you put the zombie pig into the toilet, you can get meat that, when put near the biohazard container (outside of swindon walls), zombies (like the ones from the sewers) come out. The frog park truck is located on the 2nd floor of the parking garage, and if you put the joker frog (AKA Joke Frog) into the toilet, you get a Joke Gun (Turns Frogs into Joke Frog)

Two Trucks With Trampolines/Fans on the Back:
It turns out there is more than just a frog park truck and a mars rover in swindon, there is also two more trucks, one with a fan and the other with a trampoline, which can both be turned into real, drivable trucks.

Before:





After:





Trump Location:



Common Location for Toy Cars: