I have 2 faves! The first is calling a random business (a bar, a warehouse, a mechanic, a beauty shop, etc.) and when they answer the phone, saying "Yeah, hi... can I talk to Stupid?" (or dumba$$, or something along that line). It's funny to see who they hand the phone to... and the second one is calling two Chinese take-out restaurants... call 1 first, make a heft-sized order for delivery, ask them to hold, switch to the other line, call the other Chinese place... then conference the call and have Chinese place 1 repeat your order, which gets Chinese place 2 to take that as the order... and it starts a whole lot of funny confusion.