TenToo/Rose - humor - hair dye
After about a year on Pete's World, (which he now supposed he considered his world too, although the settled and domestic connotations of that phrase still took a bit of getting used to,) the Doctor finally warmed up to (or cooled down enough to listen to, or at least tried to take heed of) the phrase "you only live once."
It was his regeneration that sparked it. (Well, not his, but his Other Self, the Time Lord in the other universe to whom he still felt a connection. One night he awoke with a burning feeling where his other heart should be - not should be, but used to be, could have been - and he realized that he must have gone from Ten to Eleven. Eleven lives. Ten regenerations in all. Two left for the Other Him, technically. But anyway.) He realized that as a Time Lord he had had the advantage of semi-invincibility, the air of a cat with nine lives, except that cats don't actually have nine lives - well, they didn't until, of course, they evolved back in the year of 67/apple/098. (Or, he supposed,forward in the year of 67/apple/098, if he wanted to get into time-traveller jargon, since the year was currently 2010.) He was no longer invincible in any way, shape, or form. He had one life.
This meant a number of things, but for some reason, the thing that felt most important was the probably completely trivial fact that he would never be ginger. (He wondered if his regenerated Other Self had achieved gingerness, but if he was being honest with himself… he doubted it. He never had been good at regeneration. All but failed the class, in fact.)
He snuck out of the house at the crack of dawn, careful not to awaken Rose, who slept so lightly now that she had life growing inside of her. (This was something that both amazed and terrified him all the time, and more and more often recently he awoke in cold sweat from a dream about Gallifrey burning, with the image of all those he had lost flashing before his eyes and the added but unclear as-of-yet face of his unborn child. The beauty of life outshone the fear of it, though - that's what he told himself - it had to.)
He made it to the convenience store down the block, bought the ginger-est hair dye he could find, and took it to the salon. He knew dyeing his hair at home would probably end in catastrophe, not to mention the fact that the fumes would be bad for Rose.
The hair stylist took one look at him and said, "Are you sure?"
He grinned and told her that he had never been more sure of anything in his life, although this was, in point of fact, completely untrue. He was terrified.
And well he should have been.
As it turned out, and as he found out from the booming laughter coming from a still-pajama-clad Rose as she caught him sneaking back into the house, (freshly ginger,) bright orange was not his color.
He kept the permanent hair dye in for the few months it took to grow it out anyway.
You only live once.