Thanus Theory
Its a popular fan theory in the Marvel cinematic universe surrounding fictional characters Thanos and ant man.
The theory states a method to defeat thanos, but in the most ridiculous but effective way.
For this ant man should go small and try to enter thanos's anus, then using his suit's regulator he should increase in size to become giant man, this process would supposedly kill thanos by bursting him inside out.
This fan theory was widely popular during avengers infinity war and was coined 'Thanus Theory' by the actor Paul Rudd who actually played the role of ant man in the MCU, during the Graham Norton Show.
Despite its fun approach there seems to be complications to actually carry on such a method to defeat the mad titan himself. This includes entering thanos's anus and thanos's skin being impenetrable also it’s impossible to actually implement this in the movies, it would be too absurd and humiliating to watch such a great supervillain being destroyed in such a method.