I bought a miniature portable black and white analogue TV+radio from some guy over the internet. I did it because it was small (15x15x24 cm) and light (about 2kg) and seller was able to prove that it actually works. It cost me about 20€.
I bought it first and then started thinking what am I going to use it for. Obviously not for watching TV because analogue stations stopped broadcasting a long time ago.
This could be a tiny display for my 8-bit computers (C64, C128, Atari 2600 and Atari 65XE) or a display for RetroPie/Kodi.
Right now the idea is to actually put Raspberry Pi 3 inside the case and make it self-contained media/entertainment/general computing device. Just like C64 was in the old days.