many… I have a bad habit of texting mates to say I've broken up with a GF, only to text Said (ex)GF. Best response was "I think I know, I was there."
I was also once having flirty text banter with a nice nurse I knew, whilst simultaneously exchanging the most depraved and disgusting jokes with a doctor friend. Of course it got mixed up, he said he'd love a drink after work but i didn't need to rub his tired feet, she said that I wasn't funny and I wasn't the kind of guy she thought I was.
Epic fail!
Mind you, once sat in the pub with my new girlfriend and my house mate when my mate sent me a text saying "do you think we should tell him?" Of course I asked tell who what? queue awkward silence!