weekly Layton puzzle #005
Professor Layton and the Unwound Future puzzle 041
requested by @alto-tenure
Thirsty Work
Rubbing his back, the waiter sighed wearily and said:
"I always use the same box to carry as many glasses as I can at a time, but there's one type of glass that I really hate carrying."
Of the four glass types pictured here, which one is the waiter talking about? Keep in mind that they all weigh the same.

