September 30, 2010 Patch (Mann-Conomy Update)
First generation Unusual effects
Green Confetti*, Purple Confetti*, Haunted Ghosts, Green Energy, Purple Energy, Circling TF Logo*, Massed Flies*, Burning Flames, Scorching Flames, Searing Plasma*, Vivid Plasma, Sunbeams*, Circling Peace Sign* and Circling Heart

August 18, 2011 Patch (Manno-Technology Bundle)
Second generation Unusual effects
Stormy Storm, Blizzardy Storm, Nuts n' Bolts, Orbiting Planets, Orbiting Fire, Bubbling, Smoking, and Steaming

October 27, 2011 Patch (Very Scary Halloween Special)
First generation Halloween Unusual effects (Usually considered first gen)
Cloudy Moon, Eerie Orbiting Fire, Flaming Lantern, and Cauldron Bubbles

October 26, 2012 Patch (Spectral Halloween Special)
Second generation Halloween Unusual effects
Knifestorm, Misty Skull, Harvest Moon, It's A Secret To Everybody and Stormy 13th Hour

May 17, 2013 Patch (Robotic Boogaloo)
Third generation Unusual effects (Robo effects)
Anti-Freeze, Electrostatic, Green Black Hole, Memory Leak, Overclocked, Phosphorous, Power Surge, Roboactive, Suplurous, and Time Warp

June 19, 2013 Patch
Fourth generation Unusual effects (Can be called Third gen. If you don't consieder the Robotic Boogaloo effects as Third gen.)
Aces High, Cloud 9, Dead Presidents, Disco Beat Down, Kill-a-Watt, Miami Nights, and Terror-Watt

October 29, 2013 Patch (Scream Fortress 2013)
First generation Unusual effects
Arcana, Chiroptera Venenata, Darkblaze, Demonflame, Hellfire, Poisoned Shadows, Something Burning This Way Comes, and Spellbound

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Gen 1 is Green Confetti, Purple Confetti, Haunted Ghosts, Green Energy, Purple Energy, Circling TF Logo, Massed Flies, Burning Flames, Scorching Flames, Searing Plasma, Vivid Plasma, Sunbeams, Circling Peace Sign, and Circling Heart.

Gen 2 is Stormy Storm, Blizzardy Storm, Nuts n' Bolts, Orbiting Planets, Orbiting Fire, Bubbling, Smoking, and Steaming.

Gen 3 is Aces High, Cloud 9, Dead Presidents, Disco Beatdown, Kill-a-Watt, Miami Nights, and Terror-Watt.