Don't bother me, I'm Concentrating

I've been looking over the D&D5e rules for maintaining concentration on spells, and I was a little bit startled at how lax they are. It's assumed that as long as you don't actually get stabbed in the guts, you can easily maintain focus on a spell.

Well, I am a lot meaner than that.

In my game, if you do anything more mentally taxing than walking along a reasonably clear path, you will have to make a DC10 Concentration check to keep a spell that requires concentration going.

Have to jump out of the way of a runaway cart? Concentration check. Being pestered by an annoying beggar-child? Concentration check.  Want to take a swing at an annoying beggar-child? Concentration check. Climb a ladder? Concentration check. Suddenly subjected to very loud noises or flashing lights or other dance-club phenomena? Concentration check. Someone throws a bucket of cold water over you? Concentration check.

If you take damage, the DC for the concentration check is 8+ the amount of damage you've taken. A separate check is required for each individual lot of damage, not for each attack — so, if you get hit by three spines from a manticore's tail for and take 4, 6, and 8 points of damage, you'd make three checks at DCs of 12, 14 and 16 respectively, not a single check at a DC of 30 even though all the damage came from a single attack.

If that seems harsh to you.... well, tough. Suck it up, and stop being such a big cry-baby.

Yet Another Hill

 I got a cheap 30-watt foam-cutting hot wand from China a few days ago, and tried it out by carving up a foam off-cut into another hill. ...