I thought that was some great scheme made by the adults.
Turns out, it isn't. Just everyday life coincidences. Reinforced by the global rythm of social life.
College ads are more likely to appear in the periods when people talk about college.
But to really answer this question, we could build a better experiment. Write out a set of topics on index cards. You have to be careful that topics aren't new product rollouts (otherwise you really have to think about how you decided to write that topic down in the first place). Draw a card, don't talk about or search the topic for some amount of time, then inject the topic where it might be observed (talk about it and/or search for it somewhere), then for some amount of time, see if it comes up.
And have a control group that you simply don't bring up at all. Make sure to have more than one, so that you still have more remaining if someone around you brings up one of your control topics.
"We were talking about new games and I got and ad for a new game!" sounds like pretty standard, non-targeted advertising. Easily chalked up to coincidence. Steam advertises new games to me, some I'm interested in and some I'm not, but I don't think Steam is reading my brainwaves.
How many Wii U games are there anyway?
Would you expect the Wii U to do some sort of correlation (other people that own the same games A & B also own C, so you're probably interested in C)?
The most blatant I've experienced was on the Wii U. The controller with the screen powers up and shows ads for new games every now and then. We actually had a bit of fun with it, casually talking about new games and guess what happened. An ad for that particular game was shown. I'm 100% certain now, that it happens with smartphones as well.