Hot glass looks the same as cold glass.

Related:

• Hot glass looks exactly the same as cold glass. --
  First Law of Laboratory...
• Life is a holiday in the same way that
  glass is a...
• The best contraceptive is a glass of cold water: not before or after,
  but instead...
• Only Irish coffee provides in a single glass all four essential food groups -
  alcohol, caffeine, sugar, and fat. -- Alex Levine...
• Look up, speak nicely, and don't twiddle your fingers all the time.
  Lewis Carroll, "Through the Looking...
• Hand me the glass. (clink) No,
  the other...
• She ain't much to see, but she looks good thru the bottom of a glass" -
  Stupid country song titles...
• And Odelein crunches Iafrate into the
  glass...
• As long as its not a _glass_
  eye.....