Scary vs funny. Which one is more appealing?

I just came across a video that I couldn't place in any of UK public campaigns. I started digging a bit deeper and I found UAMK Road Safety campaign for Czech Republic government. 

My assumption is that this is something similar to UK government's campaign THINK! However, the viral videos of the two public campaigns are different. While UK's ads appeal for safe driving is presented in a dark and scary way, Czech Republic is reaching out to people using humour.

Is it because of cultural differences?

What do you think? Which one is more appealing? Does it depend on target audience?

But see for yourself:

Ad from UK