One handed.

I can open ketchup packets one handed. You're thinking "Why do I care?" Well, I will tell you! This skill, although an easy one to acquire, is important! When eating in the car you must be able to do this if you want proper sauce-age! You can take out the small container of fry sauce, and carefully pry it open with your teeth. You have to do this part slowly or it will spit fry sauce all over your shirt! You only have the one hand because you still have the sandwich in your hand. You could put it down but then all it's ingredients will shift! Leaving you with an uneven distribution of ingredients in your sandwich. You will never get it back together in the right place, thus leaving you with one free hand. Also, this is for the car scenario and it might be dusty in there. You don't want to put your food down! After getting the fry sauce open you can carefully balance the container on your sandwich so you can dip and consume the French fries. If you have a packet of ketchup you can instead rip a corner with your teeth, and balance the fry on top of your burger while you squeeze the correct amount and consume it that way. Try to keep the corner you rip small so you can avoid over-saucing. If it is the morning you can get yourself some breakfast tots with a sandwich and balance the tot while you squeeze ketchup on to it. So there you have it. It is an important skill when dining in the car!