Freudian slip
Has it ever happened to you that, during a conversation while you wanted to say something, and something else came out, often leaving you embarrassed and ended up justifying yourself for days? Well, you know now there is a term for this.
Freudian slip, also known as parapraxis is a concept used in psychoanalysis. It is an error in speech, memory, or physical action that occurs due to the interference of an unconscious subdued wish or internal train of thought. The concept is part of classical psychoanalysis. Classical examples involve slips of the tongue, but psychoanalytic theory also embraces misreadings, mishearings, mistypings, temporary forgettings, and the mislaying and losing of objects.
You can read more about it here.
Frequency illusion
Did it ever occur to you that the frequency of certain things has just exponentially increased? Like, you just heard someone talking about something trival, a new word for example, and then later you realized you have been frequently coming across the same, again and again in a small span of time? This is called frequency illusion, also know as Baader-Meinhof phenomenon.
It is a cognitive bias in which, after noticing something for the first time, there is a tendency to notice it more often, leading someone to believe that it has a high frequency. It occurs when increased awareness of something creates the illusion that it is appearing more often.
You can read more about this here.