Running a bit of hot water on the end of the cup helps release the cube from the cup. Then just pop it in your glass and enjoy.
Having enjoyed a good whiskey for a while I recently discovered the joy of large sized ice cubes in a good whiskey! They melt much more slowly leaving but a hint of water in your whiskey. After visiting a friend with a fancy large size ice cube maker I wondered what it would take to make a sweet giant icecube.
And this is the solution... a small sized solo cup!