That's stupid. In a good way.
But do sign and trades happen these days? Legit question as I no longer pay as much attention that I used to.
The last one I remember was Hossa (or was it Havlat?) leaving Ottawa. I think it was Hossa in the Heatley deal. Ottawa was struggling to sign him to something they could afford, then Heatley had that car accident that killed his teammate (Schneider?), and needed to get out of town, so Ottawa ponied up (3x6m?) and then immediately traded him to Atlanta for Heatley and Greg de Vres. If I recall correctly. There's been other deals where players have been moved after signing a contract, but that was probably the most relevant when talking about a 'sign and trade'.