1.  Allen slipped and fell and was stabbed three times in his left shoulder and once on top of his head.

2.  He stacked crates one on top of the other, whistling as he did so.

3.  On top of which she had those unspeakable women in for tea so their unspeakable husbands will vote for your unspeakable programs.

4.  Preferably not on top of me !

5.  On top of the world...

6.  On top of the books!

7.  On top of the bottom.

8.  On top of the bottom?

9.  Not on top of the fish please.

10.  The big one with all the on top.