I asked Sherman today, "Sherman, Where tube-tube?".  It took him a bit
but he showed me.  So I said, "Sherman in tube-tube." and he stuck his
head in in then pulled it out and looked at me.  Then I said something
similar to what we say when we want them all the way in a cage or all the
way down from someplace, "Sherman, in in tube-tube, all the way in in
tube-tube." Danged it he didn't go in all the way to his tail and then
when we praised him he backed out and expected a treat (which he got).
 
We'll have to try to repeat that one so he doesn't forget.
[Posted in FML issue 4015]