When they either laugh or think I am trolling I ask them to change my mind by refuting this observation. I also tell them that I have a first hand observation while they have some vague, hand waving pictures of trajectories.
The discussions with some get interesting when they slowly discover the concept of center of mass, relative movement etc.
Children are better at that because they do not have yet opinions burned into their brains by weak schooling (schooling which prefers to drop equations than let them discover things as they go).
I have a PhD in physics so it is easier for me (and people do not assume that I am an excited flat earth believer or somethkng) but I am really sad that a lot of things which people are told are just that: told. Not done through self discovery.
Admittedly, the article defines itself as a list of things which have been labelled as pseudoscience at one point or another, and obviously the lines aren't always clear as some things make the list because of quacks' overenthusiasm and/or twisting of what is a small localised benefit into much more than it is.
Regardless, for fun here are a couple which went against my current intuitions:
Fasting: while not in vogue to cure diseases per se (although some people point to diabetes), variants of fasting seem to be in vogue at the moment.
Graphology: To me (someone with pretty lazy handwriting), I feel like comparing mine with someone's which is significantly more neat would say something about our respective personalities.
Lunar effect – the belief that the full Moon influences human behavior.
If my anecdata does not count, it sure is proven that
1. light influences human behavior
2. full Moon reflects light
Following the link, this is indeed the only proven effect of the moon: "The lunar cycle seems to influence human sleep, even when one does not 'see' the Moon and is not aware of the actual Moon phase."[Cajochen 41]
Unfortunately, the vast majority of people will run through it and will be happy ignoring the one or two on the list that they seriously subscribe to.