After watching Episode 3, I'll add to my to do list to make the electrodriver shurikens explode.
Edit: DBT, don't forget to use the Symbol of Summoning in L4D mode.
Also, I didn't hear aliens, but I heard airplanes flying over your house!
Also also, I might suggest using Monster Mayhem mode next time. THAT will get tanks to spawn! And as I said in your youtube video:
"6:58 No. It doesn't increase the chance to spawn a tank... though I could change that, because we could use some more tank loving. In maps with lots and lots of baddies, you still don't see tanks very much, though you see tons of special infected. I think tanks could use more loving by spawning them more with cyberdemon/spider masterminds, so I will definitely consider it!"
Demon Orb only spawns a few monsters that's unfriendly, one being that miniature baphomet dude that's an archvile. Yeah. Huge pain in the ass.
"well, im not too sure. I mean, we made money, but im not able to wipe my ass with $100 bills yet." - DBThanatos
"And one for Bobo the Space Monkey!" - Postal Dude
"My grandmother could beat the game if she saved as much as you do!" - Postal Dude
"Float... They aaaaaall float! And when you're down here with me, fat boy! YOU... float... too!" - Pennywise, the Dancing Clown
"In Offline Gaming We Trust" - DBT & MC
"That truck is fucked." - FPS Russia
Spetsnaz. When the only way to kill a terrorist is with a back-flipping Apache attack.