Again, a date that’s probably more for the guy than the girl. You can buy all of the parts you need to build a potato gun for less than 20 bucks (ammunition included!) which is a couple of PVC pipes and an ignition source (like a lantern lighter and hairspray). Good fun — a decent potato gun will go 50 yards. You can find instructions all over the internet.
We haven’t documented this one yet. If you have tried it, please leave your comments below!