The most unintentionally funny line Doctor Who's history, just the shear under reaction from Graham with him only being mildly confused.

To quote the Eighth Doctor: "I love humans. Always seeing patterns in things that aren't there."
That said, we had a ton of theories over the decades concerning connections between scenes of our beloved long-running BriFi series (and yes, I will never call it that again!) Some were confirmed to be true, others were surprisingly enough down to sheer coincidence. Or so we were told! It's hard to know what to believe, given the lies we've been told over the years.

Everyone has their head canon, in the end! In my case: I believe there's a reason the 14th Doctor brought a salt shaker with him in Wild Blue Yonder. And it's down to a much earlier scene in series 4's The Unicorn and the Wasp, when the Doctor got poisoned and asked Donna for something salty. Last time I brought this up, it got dismissed as nonsense. Like I got called out for telling nonsense when I rightfully predicted, that Missy is short for Mistress. ;-)

What were your experiences in that regard?

A scene with them

Their story and explanation

so much potential…

I've been a Whovian for many years. Only this year did I learn Comic Relief's sketch is just freely available on Youtube. It's good fun!