"we're all here, let's just have stand-up now"
"so-and-so isn't coming today, so let's have stand-up now"
"hey, I'll just come over there and we'll do stand-up there"
It seems so easy and innocent to simply change the time and place of stand-ups, especially when key people such as the PO or Scrum master may not be attending the meeting for the day. The reasons I recommend for not changing are: