I did not know this -

[starone]

When you drink vodka over ice, it can give you kidney failure.
When you drink rum over ice, it can give you liver failure.

When you drink whiskey over ice, it can give you heart
Problems.
When you drink gin over ice, it can give you brain problems.

Apparently, ice is really bad for you.
Warn all your friends.

[wildwood]

So that is what causes temporary focal impairment..... no more ice for me then.