none : p

If possible try to block 'the living daylights' out of them, most of the times the so called adds can mess up your computer. I block as many garbage as possible, cause i dont want to catch some nasty malware on my pc.

Last month , millions of users were apparently infected by malicious advertising.

Google : dutch websites hit by malvertising campaign
and you will get some results.
It seemed the dutch didnt check the people who advertised on their sites (typical dutch behaviour as long as the money is good they dont bother to check)

I have AdBlock on my PC's but I check my youtube account with my tablet which isn't ad-free.

So in general on my tablet with my account: when I watch some gaming-related videos, I have game trailers (well, that's logic). Then the second biggest category of ads I get are movie trailers/teasers in English or French/Dutch (two main languages in Belgium). Third category are Belgian ads (in French or Dutch). And sometimes, I get US-related (maybe because my youtube account is initially set on US to get English-speaking video suggestions) ads like for HostGator.

AdBlockPlus and NoScript say no.

same-using ABP for youtube so I see no adds

Same here.

Chronic Hepatitis C & HIV Co-Infection commercial...

WTF, does Google know something that I don't?

I got an ad for Alzheimers treatment.

I think I did.

Wait, what was I talking about?

Thanks to AdBlock Latitude, I only see ads that are part of the video itself and thus must likely ones that the video creator jave conciously chosen to include. This suits me just fine.
You were going on and on, rambling about snorting coke off an ass, so I had to hit you over the head. Sorry about the concussion.

3D fish tank app, talking Tom app, premium killers for hire, fashion accessories app, that kind of stuff.

Some ridiculous rap cr@p that i always bypass after 5 seconds, not even bothering to check what the heck it was about.

Car commercials - and I hate cars and don't have a drivers license, apparently Google doesn't know everything about me ;-)

Well, they do now...