Short stories in the genre Comedic Science Fiction

Listing 3 stories.

A stranger from the faraway future appears in a young man's room in 1952 with an urgent mission.

Aliens land peacefully on Earth and promise to fix humans’ societal problems, but humans soon get so frustrated with them that they flee to other planets. The smaller Earth population ends up bringing positive change, but this emigration to other planets reveals that many other populations have fled these aliens for the same reason.

In a futuristic intergalactic universe, a middle-aged man bored with his marriage and office job on Earth pays psychiatrists to implant a fake memory of him adventuring to Mars.