[nielu]

I'm not sure about the garage, but you can sure do it in your microwave - NileRed did a video about it: https://www.youtube.com/watch?v=l0u8Vtf2GoQ

Aaand he had to break all of his beakers afterwards: https://www.youtube.com/watch?v=tGqVMbAQhBs

[sailingparrot]

The plasma you can generate in your microwave is nowhere near 100M degrees. The low range of plasma temperature is at around ~6K Celsius.

[drran]

Such amount of plasma at 100M°K will destroy the whole building. Temperature of nuclear explosion is less than 1M°K.