Hehe, yes, it is ^^ But this time, now that the timing's more solid, I noticed you used a higher-pitched click, probably because it's a keyboard? I don't even know why, but now that I notice it, I'm realizing that for some reason the deeper click just comes off funnier. It could be because you used the sound of batman opening something, so it has this sort of quick double-click to it. That may be why. It almost comes off as a weakened connection. That'd be my mistake, I totally hadn't noticed that aspect before that that click noise itself held so much of the impact O_O I love learning new things

Anyway, I think if we can get away with it, we should try and be consistent with the two sounds. The same click, and the same boom. If we're going to change the explosion imagery out, we need to have the audio consistency so that the repetition becomes subconsciously recognizable. If we were to only have the explosion sound be the same, it would still connect, but the click and the explosion work so strongly I think it'll strengthen not just the clip, but also the entire running gag. You proved that to me unequivocally with the jackpot explosion ^^
Oh yes! One other thing about the jackpot one. I loved it, but after watching it several times the other day (yes, I still love it ^^) I noticed what it was in the back of my mind that made its ending feel odd. It's the explosion footage. He's in this posh casino and then suddenly the explosion is of a cliff edge or something. I think the 'what does this one do' one lands stronger because the explosion's in a window and the mind can connect the indoors scene and the explosion.
I could be wrong though. I found a quick building explosion in Toaru Kagaku no Railgun to give a quick test. Give it a shot and see what you think:
davidkrein.net/E07_Railgun_BuildingExplosion.rar
The aspect ratios will be off of course, I'd say just scale them to fit, it shouldn't cause any problems.
Anyway, if you can take a moment to switch it out, can you update it and post again for a comparison? I'm curious whether it'll make a difference.