So my granddaughter, age 10, comes up and proclaims to me she has mastered the dice so that she can always roll a 7 or 11 on two six sided dice.
Amused by her statement, I told her alright let's see what you can do.
She rolls the first time... it's a 7.
Rolls a second time, it's an 11.
Now I am figuring she got some loaded dice from her uncle, who is a bit of a rogue.
So I ask if I can see the dice, which she hands over to me.
They are both a clear red plastic so I can see right through them, so there is none of the usual inner holes/metal bits you might expect.
Rolling them in the hand and just doing a rough feel of the sides tells me they are not noticeably weighted to any one side or misshaped.
So I roll the dice... sure enough it comes up a 7 the first time followed by an 11 on the next throw.
I sit there pondering this trying to think of what I missed, all the while my granddaughter is giggling away at me.
Then as I really look at the dice, it hits me.
One die has all 5s on it's sides while the other die has just 2s and 6s. So 7 and 11 is ALL it can possibly roll.
I failed to notice it because I was just so used to looking at the TOP of the dice to read the numbers, the rest of the die is incidental.
So we both had a good laugh at silly grandpa.