Knock.......................knock................. .................
i was going for the "Eskimo in his landy" version

 

antichrist,
don't need to follow your link if you are talking sticky u-joints you probably correct. i cant think of any other time were you would want to blow out a grease seal
i was speaking of greasing bearing in general, i would think that anyone would be greasing a spinning u-joint, that would be a little difficult.

 

Well, since the thread was about u-joints and you asked the OP if he greased his after driving when they were hot, I could only assume you were talking about u-joints, and why I replied specifically about u-joints.
I can't think of any other bearing on a vehicle that you could get to in a short enough time that it would be hot when you lube it.