This seems to be a very appropriate place to share my and my wife’s standard smart-ass response whenever one asks the other where any given lost item X might be.
“It’s in yer butt.”
There must be 50 ways to lose your luber. 
Do you have teenagers? A spouse? A roommate? These things often get ‘borrowed.’ (That’s why I have a lock on my toy drawer. My husband can get his own lube.)
It was all used up in the Alien anal probing that you will only recall many years from now. But I would bet there is already video of it on you tube.
Wouldn’t that be youlube?
I need some of that, pronto…
Keep an eye out to see if your pet looks happier than usual when taking a dump.
Ya know, I accidentally put the Windex in the fridge after cleaning it before. Just sayin…
That stuff is great for hamjobs.
why you terrible person. Of course I never meant anything untoward.
Look under the mattress.
So did you find a way to lube your lover?
::shakes head, wanders off muttering::