Random vs. Casual.. I wondered the same thing.
Anyway... Yesterday, for the 2nd time in as many weeks, someone at work started off a conversation with, "Okay... Here's the situation." Both times, I thought to myself, "My parents went away, on a week's vay, cation."
It also has happened recently that someone (a friend; this did not happen at work) began a question to me with, "Do you remember..." I immediately cut them off and responded by uttering those "Dah! Sch-Dah!" noises that Michael Jackson makes in his song, "Remember the Time," after he sings, "Do you rememba?" at the beginning of each verse.
Both instances are examples of how pervasive music is to my mind... and they also make me wonder if I'm too silly sometimes for my own good.