The simplest answer is probably the truth

[wag_9393]

Thomas, "Daddy I'm sticky"
"Are you hot & sweaty?"
Thomas, "No"
"Did you spill pink milk on yourself?"
Thomas, "No!"
"What is it then Thomas?"
Thomas, "I'm STICKY! I got glue on myself at school! It's sticky!"

Why I look for complex reasons I don't know.