Cups with Straws

Today I spilled a half a cup of soda in my lap. This happens quite often because I overfill my cup and then attempt to "drink" the spillage that has formed on the lid. Although I am 28 years old and should fully understand the physics of cups with straws, I always tip the cup to the mouth to collect said spillage between my thirsty lips. This in turn leads for the beverage to either leak out of the lid, or for even more beverage to escape from the straw hole, and before you know it, half of my drink is seeping into my crotch.