Impact
Explanation
The Joke
An alien arrives on Earth in a dramatic fashion, crashing through a building and declaring that it lives every day like it might be its last. The comic then reveals the alien's backstory: it is from a hostile planet where it has been dodging all sorts of dangers, topping all its science and art classes, and eating from shattered glass. Basically, the alien has lived an extraordinarily intense life because its species genuinely faces death at every turn.
The joke escalates when the alien recounts the history of its kind: its people have crashed on Earth once before, and the previous visitor asked "Mom, want a huge wiener?" -- implying the alien species, despite their dramatic intensity, are fundamentally juvenile and silly. The final panel shows the alien declaring it will be working at a hot dog stand from now on, a completely anticlimactic outcome for such an apparently fearsome creature.
The Humor
The comic plays on the motivational cliche of "live every day like it's your last." While humans use this as an inspirational platitude, the alien literally does this because its species faces constant mortal danger. The humor builds through an escalating sense of how impressive and intense this alien must be, only to deflate completely with the reveal that the previous alien visitor was just hawking hot dogs, and this one plans to do the same. The juxtaposition of an impossibly dramatic backstory with the mundane reality of running a hot dog stand is the core joke -- grand cosmic beings reduced to food service workers.