Hey, mister electrician: what's that giant bottle of lube for?

So they're doing a lot of electrical work in our building, and today I noticed a liter bottle with a sport cap of something called Ideal Clear Glide.  What's that for?  "Wire Pulling."  Is that what they're calling it now?   Come to find out during the Google Image Search that it can also be purchased in 5-gallon buckets.  

 

OK, apparently wire pulling is an actual thing.  Go figure.

 

But then before I could get all inappropriate about it - good thing I didn't, eh? - I found another place where gun owners find it handy for squirting into their silencers to enhance the, um, silence.  Eww.