Spiked Bat - Baseball bat + Box of Nails
Drill Bucket - Drill + Bucket
I.E.D - Propane tank + Box of Nails
Molotov - Newspaper + Whiskey
Air Horn - Traffic Cone + Spray Paint
Beer Hat - Beer + Hard Hat
Boomstick - Shotgun + Pitchfork
Paddle Saw - Chain saw + Paddle
Electric Rake - Leaf Rake + Car Battery
They carry over from game to game, so you don't have to complete them all in the same run.