Not on a strap? Watch where you leave the TX!
On Sunday after getting my plane started I picked it up off of the table to set it down on the ground to taxi. As I picked it up, I knocked the Tx off the table which at some point knocked the throttle from idle to full.
I was holding a plane which suddenly wanted to leap from my hands! Fortunately, the Tx landed sticks up, so I was able to knock it back to idle with my foot before setting the plane down.
To add further insult, the tip of the antenna was bent in the fall.
I do have a strap but have not started using it yet. When I do, despite this experience I'll clip it on at the flight line. Having a Tx hanging around your neck when lifting a plane I still think is more risky than leaving sitting on the table. I'll just have to be more careful where I place it.