if it's stupid but it works, then it isnt stupid.

[Jul 02 2004, last modified May 23 2005]

breathalyser operated key locker (0)
central coffee (+2)
central methane collection grid (+1)
cowpie gathering robot (0)
dirt slinging wildfire fighting device (0)
dodgercise (0)
forever turbine (+3, -1)
gas turbine powered hot air dirigible (+3)
gasification powered lawnmower (+5, -2)
gnomish beer mug (+1)
inverted tax (+4, -2)
nitrous oxide assisted jet engine (+5, -1)
peltier-charger for weapon electronics (+1)
pulse ramjet (+3, -2)
recoil powered machine gun cooling system (+3, -1)
scavenger van (+1)
sun-shine (0)
universal jump off receptacle (+3)

random, halfbakery