I wear t-shirts most of the time. I sometimes wear shirts, but I'm generally more comfortable in t-shirts. So over the years I've amassed quite a large number of geeky, funny, weird t-shirts, as well as a reasonable number of t-shirts from specific events. While some of the t-shirts are fun / cool. Others are pretty awful and I wouldn't bother bringing them back from an event these days.
Here's how the spare room currently looks:
And no, there's no prizes for trying to recognise them from this photo 🙂