Lots of things are conceivable. Gods are conceivable, as are angels and demons. It's conceivable that you are the only sentient being in existence besides me and that I am a vast superintelligence controlling everything you see and hear, posting little reminders of the truth like this just to fuck with you.

However, I doubt you're going to spend much time on that, and I'm not going to spend much time on other things that are merely conceivable.