The Movie: In the final battle, the Cap uses his super-strength to chuck Black Widow up to an alien ship, which she grabs on to effortlessly.
Real Life: If you are really tired of having arms, then you should grab on to a passing spaceship like Black Widow did. That'll take those pesky limbs off in no time. Natasha Romanoff can fight a lot of things, but the laws of inertia are not among them. The same rule applies for the Hulk punching out one of the alien Leviathans. We get it — it looks awesome! But even the Hulk does not have enough mass to stop an object moving at that velocity with a single punch. We'll forgive it, of course, because if Hulk can't punch down the occasional space whale then what is the point of movies?