Speaking of which...
C1Transitioning to a related topic.
To cut a long story short...
C1To summarize a lengthy narrative.
It all started when...
C1Beginning a narrative.
One time...
C1Beginning an anecdote.
I'll never forget...
C1Introducing a memorable event.
The thing is...
C1Introducing a crucial point or clarification.
Looking back...
C1Reflecting on past events.
That's when things got interesting...
C1Introducing a turning point in a story.
And then, out of the blue...
C1Introducing an unexpected event.
To make a long story short...
C1Summarizing a lengthy event.
As I recall...
C1Recalling a memory.
If I remember correctly...
C1Recalling a memory with a degree of uncertainty.
It's funny you should mention that...
C1Responding to a relevant comment.
That's when it hit me...
C1Describing a sudden realization.
I've always cherished the memory of...
C1Expressing fondness for a past event.
This brings back memories...
C1Expressing nostalgia.
It's a vivid memory...
C1Describing a clear recollection.
I distinctly remember...
C1Emphasizing a clear recollection.
It's a long story.
C2The explanation is lengthy and complicated.
To cut a long story short...
C2To summarize a lengthy narrative briefly.
That reminds me of...
C2Used to introduce a related personal anecdote.
Speaking of which...
C2Used to smoothly transition to a related topic.
That's when things got interesting.
C2Used to indicate a turning point in a narrative.
It all started when...
C2Used to begin a story.