Ok, here are my 'true story' tales
I saw a guy do soft breaks on a stack of 3 2" cap blocks.
Broke the bottom one on the first strike, then the middle
then the upper one.
Only time I've seen someone else do something like that.
Personally these are my tales:
After a 3-4 hour workout training different chi kungs from
tai chi/hsing yi/bagua I feel like I saw a hazy glow around my
own hands.
After doing a really long session of static 8 mother palm chi kung
in moving from the grasping palm to forward palm I thought I saw
a 'pop' of light between my hands for a second.
Heat, vibration etc are normal for me during any chi kung or while
doing a form (either external or internal) or during a particularly
strenuous sparring match.
but, I'm sure I was imagining all of it.