My dad bought me this tiny harmonica on holiday (my family know I collect tiny things now). This harmonica keychain isn't really much more than a simple novelty. It can play 8 very shrill notes and I doubt anyone would consider it to be a real musical instrument. But it's tiny, it makes a noise, so here it is.

This tiny MB Battleship keychain replicates the childhood favourite as well as could be reasonably expected for such a small game. Of course, there are no pegs (they would be ludicrously small), only two ships per player and a tiny playing grid, but it's still possible to play a game of Battleships with this.

The plastic box lid snaps over the whole thing to keep everything safe, just like a full-size Battleship game.

This Bat Signal keychain came free with the Holy Special Edition DVD release of 1966's "Batman: The Movie". Press the little button and it'll project a Batman logo onto any surface you point it at (the focusing ring can also be adjusted to help focus the image).

What does the Bat Signal look like? Click the image to find out.

I picked up a set of these two tiny ping pong paddles / ball for £1 in a local poundshop. What a steal! It also came with a net (not pictured). As I already had a small table tennis table but no bats for it, I'm glad to have found these.

As you can imagine, it's a real challenge to actually play table tennis with such tiny paddles. My sister and I rarely manage a rally of more than 3 on a good day.

I'm sure this will be nostalgic for many of you. It's a mini version of the Velcro tennis ball catch game. Each mitt fits on a single fingertip. I don't know what this game is really called, to be honest.

Growing up, we used to call it stick ball (because you throw the ball and it sticks. Obviously.) To this day, I still play it anytime I go to the beach with my sister. Like with the table tennis set, catching the teeny tiny tennis ball with the Velcro pad is no easy feat!