I have two cats that I have clicker trained. They can: shake, high-five, fist bump, stand up, and will "go here" and come and touch your finger. They won't do any of the tricks without treats :)
One of the cats had seemed interested in fetch for several years but it never quite worked. I tried a bunch of different toys and finally found a plastic spring that she will fetch very well.
I recently replaced a bunch of bulbs in my recording studio with LED and it was a huge mistake. They are basically RFI cannons. I removed them after realizing what was going on. I spent a couple of days hunting down a really nasty rogue noise and it ended up being a LIFX bulb I had forgotten about. Now I have to find a huge pile of black market incandescent bulbs...
One of the cats had seemed interested in fetch for several years but it never quite worked. I tried a bunch of different toys and finally found a plastic spring that she will fetch very well.