Based on the context and the answer, generate a question. 

Context: I gave some to Wakaba earlier . " The scientist explained then began twirling his hair around his finger . " Speechless ? Of course you would be . " He explained still twirling his hair around a slim digit . It was those words that kick started Tatsumi 's brain again .

Answer:

It 's due to past experiences .



What may be the reason a few words triggers someone like that ?