What gadget to build for a million Volts ?

[Externet]

Hi. Someone gave me one of these 1MV 'pulse inverter' 3 to 7 VDC in, painful Vout.

What would you build with it ?
----> https://www.ebay.com/itm/194258519800?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649

 

[nsaspook]

It's a stun gun module. Build a STUN-GUN.

 

[rjenkinsgb]

I believe they are produced as gas igniters - at 1.5V they sound exactly like the ignition system in my gas hob.