I'm going to put a toilet seat in our dishwasher
Why would you put a toilet seat in there?
Because I feel like it.
Toilet seats are not going to fit in the dishwasher. It is meant more for dishes and it is unsanitary to have it in there. It could also break something.
I'm going to do it anyway.
The dishwasher is only meant for kitchen items. You shouldn't put something in there that doesn't belong. It might cause more problems than you might be able to handle.