Insist that someday you'll learn to touch them "right" and then it will never hurt again.
Assume that the lack of meaningless small-talk means they're angry with you, after living together for 16 years.
Pinch their armpits. Constantly. For hours. *grit my teeth and don't lose it, because she's TWO YEARS OLD*
Lick your finger and stick it in their navel. While standing on their toes *note to self-- someday you'll miss this*
Insist on using only nonverbal communication, even though you are perfectly capable of talking. I tolerate this-- barely-- from the two-year-old who is fully verbal for EVERYONE ELSE. I find it much more difficult to tolerate from the five-year-old. I am seriously considering ceasing to tolerate it from FULLY-GROWN, FULLY-VERBAL, NON-AUTISTIC ADULTS. I really think I'm going to stop feeling guilty about missing heavily veiled hints and not knowing how I'm supposed to respond to puppy-dog eyes and loaded sighs. Isn't that considered passive-aggressive communication or something??
Be a narcissistic twat.
Put them under a huge amount of stress, tell them something once in passing, and then call them a liar when they misremember it.
Know that you have problems with impulse control, ask them to help you with your impulse control, and then accuse them of selfishly crushing your dreams when you say, "We're deep in debt for things you wanted. Maybe someday, when all this stuff is repaired and/or paid for, but we can't buy that right now."
Tell them it's OK to do, feel, or show something, and then get mad at them for it.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"