Here we have an Idris Elba story about Nic Cage and Dracula's castle that basically proves that he is 100% definitely a vampire (or, at least, is exactly as eccentric as the Internet would like to believe). In Elba's own words, as told in his Reddit AMA:
Yeah - Nic Cage came back one day on set, and he came down to set and he looked a little bit tired, a little bit - kind of like he'd ben up all night. So I was like "hey Nic man, how you doing man" and he said "i'm alright' and I said "You seem a little spoked out" and he said "Yeah man, I went up to Dracula's castle...the ruins up in the mountains, and I stayed the night" and i said "What?! Why|?" and he said "I just had to channel the energy, and it was pretty spooky up there." We were shooting in Romania, Transylvania, and he just went up there to spend the night, as you do.
And then he walked away.
Elba also talked about "The Wire," playing villains and really loving "Mary Poppins." Read the whole thing over on Reddit.