Dangerous tattoo remover from eBay is a MILLION watt laser

You've obviously never heard of styropyro who builds insanely strong lasers with basically salvaged junk electronics. ▶ this video

Tattoo removal tends to use ~1MW pulsed lasers (yes, megawatt). The pulse is extremely short (nanoseconds), but at that power/instant-brightness it's enough to fry sensitive imaging electronics. Can also do fun things like blast holes through CDs. I'd learned about the topic the other day here ("plays" with a cheap tattoo removal kit off the web): ▶ this video

More worryingly, it’s possible to buy pre-built laser etchers online that don’t come with safety glass: link And Q-switched pulse lasers for hair removal (i.e. to be aimed at your face) whose included safety goggles are more than a little suspicious: ▶ this video

Dunno man you can buy some really wack lasers off of ebay: ▶ this video They were talking about this kind of particle accelerator in the 90s back when I used to hang out with accelerator physicists. Though back then it was going to be terahertz waves rather than lasers. Still got to power it with something. IMO best mad scientist weapon is something like this: link