This trick is quite similar to the last one in concept. Here one hand throws a vertical floater as shown:
Throw the club slightly back towards yourself and as it passes by your head give it a bash with your forehead. I have seen this trick done continuously from one hand and, surprisingly, it looked quite good. The main thing to remember is that your head should come to the club, not the other way around - don't actually throw the club at your head, instead aim a few inches in front. Hold the clubs near the middle when doing the floaters, it's easier to keep them vertical that way.