My scariest:
Walked in the mobile home of a frequent flyer with a fairly new partner: we talked to him for a couple of minutes (Usually he called, we talked to him, we left with a refusal: he was lonely more than anything). This time he got between us and the door, and as he was talking he walked by the kitchen Island and grabbed a handgun off of it. he never pointed it at us, but in our general direction.
Our radios had the orange emergency button, but every time someone hit it, dispatch would say "Unit XX you are in emergency status, do you need help" real useful. I had a shoulder mike on, reached to the radio, turned the volume down, and keyed it up and held if for 15 minutes, while I was talking to the man. (Dispatch could block out that radio dispatch so that it didn't lock out the entire channel; and put it onto an ops channel).
I talked to him, nicely; along the lines of "sir, you don't want to hold a gun on us" etc, later I heard that dispatch got over 100 radio calls on the main channel about us (including a crew screwing around). Nice thing the radio ID'd to dispatch who we were, and they knew where we were.
We finally were able to talk to him, and move to the door as I was backing out, right behind my partner (who as she went out the door she disappeared {that scared me as much as the guy with the gun} turned out a cop grabbed her and threw her off the porch). I cleared the door, with the guy right behind me, I jumped off the porch and a K-9 took out the guy.