[Petruchio]

I say we drop something in our side of the tunnel that when it blows, The roof comes off the Mexican house.

Stick a hose from a tank of Acetylene in the tunnel and open the valve for 10 to 15 minutes and then introduce a spark . . .

Fastest way to find the other end of the tunnel.

:-)

[WindOracle]

When we were kids, my brother and I got the bright idea to pour some carbide down a mole's hole and pour some water in. Woulda just gassed him, but my brother dropped a match in and blew a small trench, a couple inches deep across my mom's yard. Man, did we get a whuppin.