Answer by Simon Hayes:
Being as it wasn’t me who asked this question, I’d hazard a guess that the answer is a resounding “Yes !”.
(But to any solipsists out there: DON’T PANIC – chances are I’m just a figment of your imagination :-)).
P.S. My dog has just this instant thrown up his breakfast – in three separate (but equally unlovely) steaming piles all over the kitchen floor. Since I can’t imagine myself wishing this into being, I take this as further empirical proof that there is indeed something “out there” (in this case, one shaggy-haired creature with a tummy problem and a slightly shamefaced expression on his furry features).