Close but always leave them wanting more. Say you're not going to interrupt when you clearly have then see how they respond and/or wander off and come back after 5 mins and do the same thing again another way
It is time!
I might have gone for ''Don't mind me, I'll try not to interrupt.''
It interrupts by doing the opposite of what it says and I might have even thrown a at the end too. Smileys are your friend, use them.