I love silicone sealant. OK, I hate using it, and by the end of an intense session I tend to look like I've taken moneyshots from the entire sixth form in some bizarre public school initiation. However, it's useful stuff and just lately I've become attached to having a small tube of the gunk in my toolbox. At first, I bought a little tube and immediately regretted forking out stupid money compared to when you buy one of those big, trigger-operated do-the-bathroom jobs.
So... in these days of plastic toothpaste tubes, it seemed to make sense to wash out an empty one, give it a few days to dry, roll it up to get rid of the air, then, like some weird insemination process (of which I honestly have only limited experience), I used a big trigger-tube to fill the little 'un. Tool box joy and more money to spend on electro-shock therapy. MP