Two minutes of video of the hovertank from Serious Sam II in action, including numerous enemies as well as powerups.
Just over a minute of kamikazes, crazed beasts, and psychotic stockbrokers, along with NPCs and Sam's weapons.
Almost two minutes of video of the end boss of the first world in Serious Sam II. Spoiler warning: If you wish to keep the first boss a surprise, do not watch this!