Ask HN: What weird startup ideas do you have?

One of mine is a laundromat using great bit industrial laundry machines like you see in hospitals and prisons. Instead of keeping everyone's clothing separate everyone needs to put an RFID chip on each item of clothing. We use automation to sort clothing into multiple streams for different types of washing, and to put it all back together so the customer can pick it up. While robots have a hard time manipulating fabric they should have a much doing simple tasks like picking clothing items off of a conveyor belt, more complicated tasks like folding would be done by people.

RFIDs ensure that the clothing is washed perfectly every time and costs go down because we can use more industrial techniques. If you're interested in evil data-gathering you can get a bunch of metadata about people based on what they wear, how often they wear it, how often the keep old clothes, etc.

Eventually we will have SOME people living on mars or the moon or wherever in space. Why waste fuel getting into orbit from these planets with low gravity?

A giant rail-gun-like rollercoaster that gently curves upwards. The combination of the right angle and the right velocity should be enough to fling you off the planet. I guess someone more mathematically inclined could do the actual math for me.

an artisanal sourdough bakery except ordering supplies is entirely automated by software

I send front and side-view photos of myself in my underwear and enter my height and weight on a site and some preferences like my favorite color. The site sends me clothes on a subscription basis that are guaranteed to fit and look good on me. This does not exist. Sites that are "exactly like that except for X" are not that.

Landfill mining. Send droids into landfills to find stuff to resell. Easy side would be obvious items like coins, lost jewelry, etc. Intermediate would be collectibles. Moonshot would be difficult recyclables: lithium batteries, gold- or silver-bearing circuit boards, etc.