1st one, when we lived in Nebraska (1987) had a sawed off double barrel. He had it in one hand, his "workbag" in the other. More complete story than the above: when I drew down, this one actually jumped back out the window he pad pried open, after dropping his stuff. I heard tires screech, back fence was along a county road, then a crash noise less than a minute later while I was dialing 911. These geniuses were fleeing, towards the Sherriff's office and clipped a deputy just going out on patrol. I didn't even have to testify in person at their trial on multiple counts.
The other, when we lived in Ohio (1995), had a .38 revolver. This douche nozzle had it tucked in the front of his waistband, right down the back of his zipper. It stayed there until the cops came, disarmed him and took him away. I had him lay on his back, with his hands tucked in the back of his waistband.
Both thought the house was empty, apparently they did check out the parking habits of folks along the street.
I usually parked my pickup in the driveway, and my wife would park in her half of the garage. My half has the power tools.
She was gone on a business trip both times, so I had parked inside.
Neither were prepared for an armed resident trained in proper situational awareness and defensive techniques.