GrinderTheTroll, Tomahawk:
Actually, the DM in the campaign in which my brother played did a
D & D/
Traveller one-shot crossover adventure (this was in the early- or mid-1980s, a few years before
SR came out), during which my brother's character had a rather interesting encounter.

It seems that he came across a magician of some sort, who began speaking in tongues and gesturing, apparently casting a spell. My brother's PC did an
Indiana Jones impression. He didn't wait for the guy to finish; he simply drew a silenced automatic pistol loaded with explosive bullets and shot him in the head.
("Geek the Mage *FIRST*!"

)
During the same adventure, the DM, who was a bit of a World War II history buff, sent a "Goliath" after them when they ducked behind a wall to get protection from pursuing troops. For those of you who haven't heard of a "Goliath", it's a small remote-controlled tracked vehicle--essentially a miniature tank. There were several models, the largest of which was about 1.6 meters (64 inches) long, .876 meter (34.5 inches) wide and .51 meter (20 inches) high, packed with about 31.5 Kg (80 pounds) of remote-detonated explosives. It was guided by hand-held remote-control unit, linked to the vehicle by an internal spool of wire. Because of this, it was strictly a line-of-sight weapon; the operator had to be within visual range of the intended target.
Unfortunately for the Germans (and fortunately for any intended targets), they weren't very successful when fielded, because they proved to be very slow (only about 16 Kph, IIRC; the source I just consulted,
Lone Sentry, says that they were mainly employed in Italy (and possibly Russia as well), describes the maximum speed of a Goliath as "...equivalent to a fast walk..."), and says that they could not travel very well over rough terrain. In addition, they were highly vulnerable to small-arms fire, because they had almost no armor.
Anyway, a PC tried to stop it (by shooting at it with an SMG), and my brother's PC shouted a warning--unfortunately, he was a little late.

The little beastie blew up, and the other character was basically rolled up into a ball and thrown against the wall behind him, bowling-ball style. Had the DM (and the dice

) not been rather kind to him, the character would have died.
As I believe someone on
Blaize O'Glory's RPG Character Post-Mortem Hall of Fame said, "[n]ever give a sadistic DM ideas when you're in a vulnerable position. Gag vocal party members early."

--Foreigner