I don't know about cookie jars or lack thereof... but I guess some sessions start a little dry - like:
'So how was your week?'
'Well, [blah... blah.]'
'...?'
'...!'
'...'
and I have this awkward few seconds where I think, 'OMG, I only just got here and I have nothing left to say!' But before panic can set in my T has a great habit of asking a pertinent question, and we get on a roll.

I'm a little nervous for next session actually, as she's been away for a few weeks, and so maybe she'll see a perceptible change in me... I hope I haven't gone too much downhill since she last saw me, y'anno? I do also have some guilt because during our hiatus I haven't really been a good girl - there's been SI, lots of binge eating, an identity crisis that resulted in me becoming blonde, and I've not worked on the things we agreed I would. I wanted her to come back and be like 'Wow, you're doing great!' and instead I think she'll be more like 'Oh. Oh dear.'