“Technically you would only need one time traveler convention.”
“Lesson one in time travel, Thursday. First of all, we are all time travellers. The vast majority of us manage only one day per day.”
“With ignorant masses, the travel back in time is not only a possible travel, but it is the only travel!”
“Hey presto: time travel. You don't need a time machine, it turns out, you just need a friend to laugh like a teenager. Chronology shivers.”
“It's like time travel only, you know, slower...”
“I understand now that boundaries between noise and sound are conventions. All boundaries are conventions, waiting to be transcended. One may transcend any convention if only one can first conceive of doing so.”