ROFLOL... we've done this SO many times and it ends up in the oddest places. It's often in a toy bin or box. Other times it's been in a pocket (that's in the laundry!)... why does my DH carry the remote in his pocket? And other times it's CRAMMED into the couch or recliner... seriously there have been so many times when I ripped the living apart and would swear it wasn't there... and it was! LOL!
A lot of the time when ours goes missing, it has fallen through the inner side of the chair down to the ground right beside the recliner so we can't see it.
When will they come up with the Clapper for the Remote... DH always says, " We can put a man on the moon, but can't figure out how to keep from loosing our keys, remote or your (meaning me) purse!"
Stuffed under the edge of a cabinet where you can't see it unless you're crawling on the floor.... at least that's where I found ours. hahahaha. Good luck finding it.