Serious Sam in weekly Humble Bundle

Humble Bundle are at it again, and this week the sale is seriously Serious Sam flavoured. The collection of games includes: {Serious Sam 3: BFE}, {Serious Sam 2}, {Serious Sam HD}: The First Encounter, {Serious Sam HD: The Second Encounter}, {Serious Sam: The Random Encounter}, Serious Sam Double D, Serious Sam Kamikaze Attack, and Serious Sam Public Test 2. That's a whole lot of seriousness. Here's the link.