A box set day is a massive treat for any TV fan. Watch that show you've been meaning to catch up on, or rewatch an old favourite. Do it solo, or get your mates involved. My brother and I once tried to watch a whole series of 24 in one day. We didn't succeed — we passed out on the sofa at about 3 a.m. But it was fun trying, and there was definitely no pressure to actually achieve it — in fact, we knew it'd be impossible, and setting ourselves up for a fail was part of the enjoyment.