I belive you think that maximum speed of anything is constant, and known as C.
Many experiments proven that, people take it for granted.
Well, it would be true if only you were the only 1 aware being on universe with ultimatly simple perception organ.
Now stop thinking about other peoples point ov view as equal, but rather as not real.
Assume for a while that you are sentient, and everything(-one) are bots controled by action-reaction.
Imagine now something like particle accelerator, wich instead of partuicle can accelerate bigger things, 2mx2m.
Now put 1 human iside it, and start accelerating.
When he reach 90% of c, compare his clock with yours.
Now stop this machine, go inside and ask someone outside to do same.
You reach 90% of c, and clocks are compared.
Now ask yourself a question, 'why my point of view (v = 0) always has faster clock', 'why every single event happening in the universe depends on my speed from it, here - speed of clock in the lab. Im in machine, its slow, im outside - its fast'.
Really do that, imagine you do this experiment in real life.
Imagine yourself in this situation, and belive that this universe is unreal, you live in a virtual simulation created for admin-knows-only purpose.
Why? Because i belive 1 am only real thing. And anyone who understand this post instead of throwing idea away for some reasons, will belive that he is the only real thing.
And then, what in your/mine brain is real, maybe universe is just reflection of a brain, and they are kond of opposite? Perception generate events, events alter perception creating self-sustaining quantum reaction, going to predefined destination, by means of evolution.
Perhaps nothing is real, universe its just an advanced program designed to crack password for something made by advanced being(s).