Flying into a sun.
Superman and Thor are a couple of superheroes who have done this. There may be others. This is complete nonsense. The sun is a perpetual nuclear reaction a million times bigger than Earth. Let's put some context in here. Thor has been hurt by punches from Hulk and Juggernaut. Superman was killed (or at least punched into a coma) by Doomsday. None of those blows generated anything like planet destroying energy, because the Earth was unfazed. They didn't even generate the energy equivalent to the shitty underground nuke tests by Pakistan and North Korea (equivalent to about 9 kilotons or TNT or 3 x 10^10 joules).
The largest nuclear bomb ever tested, the Tsar bomb, generated 2.1×10^17 joules of energy, equivalent to 50 megatons of TNT. It created a fireball 6 miles wide and blew out windows 700 miles away in Finland. The shockwave went around the earth twice. The punches from Hulk and Doomsday didn't do that.
The sun puts out 3.8×10^26 joules EVERY SECOND. So every second, it pumps out about 2,000,000,000 times the energy of the Tsar bomb. Every second.
Those guys aren't strolling through that.