Such as, following the sad news of Elisabeth Sladen's death last week, one of my friends set up a just giving page in her memory.
Having just got paid, I've just logged on to make my donation, and from an initial target of £150, they're already up to over £5700.
Thank you, Gemma & Kaz, for setting up the page. Thank you, everyone who's already donated. Anyone who hasn't donated, please do. It doesn't have to be a massive amount - just a fiver or a tenner will show you care and help to make a difference.