Shah Rukh Khan always stands by people close to him. Director Aziz Mirza is one such person–he is SRK's mentor and one of the prime driving forces behind kick-starting SRK's career!
Mirza wanted SRK to do the voiceover for Kismat Konnection and, well, just one phone call was all it took. The moment King Khan landed from London, he rushed to meet Mirza (on Monday night at 1.30 a.m.), went to the dubbing studio and finished recording. Even Mirza was stunned at the actor's energy level.
Now, one definitely needs some Kismat Konnection to make SRK do something like this.