Sign for Thank You

We are working on the signs for please and thank you. We've been spending more time on "thank you", but Lucas is a little confused. Whenever he hands me something I tell him thank you and do the sign, so now he thinks that he should do this sign whenever he hands us something. The other day he brought one of my shoes over to Jeff, sat it down by his foot, quickly did the sign for thank you, and ran away. He'll get it eventually.