Easily kill Rail/Spider bots
On the level U-genix U-genious, the best way to kill the spider and rail bots is to use the dispersion gun (once you have it).

Get the Jeep on the Dam in Siberia
Flip the jeep and cover it in about 20-30 remote mines and then flip it upright and move it near the dam, if you're lucky it'll fly onto the dam.

Slap People
Charge a brick/mine and as soon as you release it, melee, you should now have your hand as a weapon and you can slap people.