Take a balloon.
Blow it up to almost full, leave it just a little soft.
Hold it as close as you possibly can to your face.
Using just the fleshy part of your fingers, squeeze it.
Always increasing the pressure.
It's fun in the beginning. Squeezing it is exciting, the anticipation making you almost giddy, but each push of your fingers makes you flinch a little more.
You must increase the pressure, firmer and harder with the balloon directly before your face.
You are not allowed to relax and start again. No easing up, no stopping.
It starts to make those stretching noises, you know it's about to burst. You clench your teeth and flinch faster. It's not fun anymore, the bad part is coming.
Regardless of how much you are expecting it, when it does explode, you know it will be loud and startling. Just for a second or two, leaving you gasping for a breath.
That's what waiting for this feels like.