$2 bills are a gift from above for tips...I recently went to my bank and got a full bank stack of $2 bills that were consecutively serial numbered. Every time I had any work done around the house, I tipped with two consecutively numbered bills and the recipients face lit up like I handed them a Jackson.
My nephew is graduating from college tomorrow and I'm going to send him a graduation card stuffed with 2 pads of $2 bills inside. I figure nobody else in the family will do anything like that.
One of the cooks at the local Eagles Aerie really likes $2 bills, so I often pay for my meals with them and flag him down in the kitchen so he can trade out for them.