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Family having conversation at dining table. After seeing her elder sister getting served with coffee, so brother asks for him also.
Young Son: I want coffee.
Father: No way, dude. You don't give crack to somebody who's already on speed.
Mother: Don't worry, we switched him to decaf.
Elder Daughter: As long as you don't switch me.
Mother: No, baby, that would be child abuse.
Your scenario is a joke.
"Real" coffee drinkers like the caffeine kick they get with their coffee and the Elder Daughter is making that obvious.
The Mother is equating giving decaffinated coffee to abusively denying something to a child.
The phrase "switch me" means "beat me with a small stick" or "spank me" or even perhaps "exchange me for something or someone else." The pun comes from the different meanings of switch; the phrase "switch me" is short for "switch me to another type of coffee" or short for "switch my coffee."
