What's a weird thing you can't do

I could whistle when I was younger, but now my upper lip has a little crack in it, so it doesn't work anymore.
I also never had a brainfreeze, I can chug down a slushie and only get a cold throat.

I have the opposite problem. I can't eat ice cream without getting brain freeze, and the fact that I also have sensitive teeth makes the experience even more uncomfortable.
 
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