Heh...I have experience in this department.
I get offers like this from almost every person in my redraft league. I get something like Vazquez+Percival for Lincecum a couple times a week. I usually take things like this in stride and calmly press "reject", except for one case. That was in 2006, when another guy offered Liriano for Manny 3 hours after Liriano's season-ending injury was announced
. I went off on him in an epic rant, and I haven't traded with him since. Smarmy bastard.