You try to remain calm as the counter counts down. 10 .... 9 .... 8 .... You diffuse the bomb 7 .... 6 .... but even so the timer continues to count down 5 .... 4 .... 3 .... and there is no way of knowing if you have been successful or not until the counter reaches zero.
2 .... 1 ....
Throw a die.
