Tony Stark hated to shower abroad, and by "abroad" he meant anywhere without JARVIS. The water poured over his body, warm enough to cover glass and polished steel alike in a film of fine droplets, but still not warm enough.
"JARVIS, two degrees warmer," he said as he lathered his hair.
"Of course, sir," replied the placid British voice. "Would that be Fahrenheit or Celsius?"
"Fahrenheit."
"Your continued reliance on Imperial units for your personal hygiene-"
"Make that 1.12 degrees Celsius," Tony replied, and immediately the water warmed.
It was their usual argument.