Everyone should watch this video where Bjork almost dies, and sample the living hell out of it.
https://youtu.be/75WFTHpOw8Y
Is that really dangerous?
Yes, the Capacitors in those old school TVs can hold *greater than wall electricity* for days/weeks/months.
She was probably flirting with severe discomfort and mild burns and nerve damage, but possibly death.
Good rule of thumb is, if the object in question gets its power from a wall wart(black brick at wall end of power cord), its safe to the average human to open up and poke at, even while its powered on. Some exceptions. If it's an old TV or large tube amp (especially Music Man amps), do yourself a favor and stay well away. Or learn how to bleed caps.