Great thread!! We have a JRT, a lovely little boy named Spud by DS! He is a rescue dog, we've had him for just over a year. He has zero recall, but on the few occasions he has managed to get out of the door, he has gone to the same place and has mostly come to us/let us pick him up when we have bribed him with the sight of his harness and lead and walkies
silly dog doesn't seem understand that he is already out for walkies by himself! We have a massive garden which he has the run of, but he has to stay on a long line when we walk him or we'd probably never see him again 
He is quite timid still, but getting so much better than when we first got him and he wouldn't come out from under the table. He is still terrified of the camera for some reason, so pictures of him are difficult....I try to get him used to it by taking pictures of him digging, when his terrier instincts are stronger than his fear.
He won't sit for treats, but will jump up for them on command!! He didn't know how to get dry after a rainy walk/bath and would sit look confused and sad, so we've had to teach him.....he can now dry his beard and face and his paws....just needs to master rolling his back on a towel!
We've just come out of the 'chew everything' phase...unless he finds a pen and then he just can't resist crunching it up!
He sleeps mostly in a chair in DS's room at night, but will happily go into any of the kids beds for a cuddle at bedtime!
Spud is a very clever boy - he knows when 'daddy' is coming home, despite DH working different shifts each week...he knows how to get a treat (sit by the dog food drawer and look cute) he sits by the door to be let out....he knows humans putting shoes on means we are going out, but he seems to know to sit in his bed when I am taking DS to speech therapy every thursday as he obviously can't come. I swear he somehow knows days/times and what happens at certain times 
My mum's JRT (Podge) is Spud's best friend....Podge is older, probably 8/9 so not so energetic and has separation anxiety towards my mum, but they love each other and play fight all over the place and then sleep in one bed together top to tail, like a Yin and Yang symbol). They both miss each other terribly when they are apart....luckily we are all about to move in together, so they will be in their element :)
I will try and put a picture of Spud on my profile...he is so handsome!