With a hat tip to Michael42er (Check out the comments here)  I'm working on a giraffe-in-a-box project. I'm utilising the vertical pendulum mechanism but fitting it into a box with a giraffe sticking out of the top. It'll bob up and down as the box is moved.

I was considering a full Jack-in-a-Box movement but the range of motion of the vertical pendulum mechanism is only approx. ±15mm. Instead I'm planning to add a retractable section of the box which will close over the head in its upper position and pull down to reveal the giraffe when retracted.

Should be fun!