Worms of all things can be sad. You wouldn't think so, but just listen to the Wormsong. It's the way they sing "'Til the end" that does it. It has this forlorn, wistful quality to it that suggests they really just wish it was all over, or that they know "'Til the end" means "Until we're gone too." But no matter how bad things get, no matter how long it lasts, no matter how many of them die, those little guys will keep on fighting. Godspeed, you tiny pink psychopaths.
We are Worms, we're the best, and we've come to win the war,
We'll stand, we'll never run, stay until it's done,
Though our friends may fall and our world be blown apart,
We'll strike with all our might, we'll fight for what is right,
'Til the end.
This clip from Worms: Open Warfare 2 sticks out as almost tear-inducing.