How long do you think it's going to take the MC to figure out the dual portal trick? Two portals, both facing each other with one on top and the other below. Toss a toaster in there and about 2 minutes later you've got a toaster traveling at terminal velocity of around 200mph. Switch out the top portal to launch your toaster at someone unsuspecting.
It works even better in a vacuum, with speeds increasing up to 20,000mph. If you toss an iron anvil in there and it increases to 20,000mph, you've essentially got a super-dense rail-gun that will blow up an entire building (and the surrounding buildings) the second you release it.
Next you take 50 anvils and...
