Dear Young Dude,
I’m sorry I let you cut in front of me at the store. You see, I noticed you only had a can of soda in your hand, and I knew that my overladen basket of groceries would take a while to scan and bag. Also, I had my eye on that giant can of Diet Red Bull in the case near the register, and I thought that letting you go in front of me would give me time to get some of that delicious highly-caffeinated goodness. So I waved you ahead of me, only half noticing how you nervously avoided my eyes as you muttered your thanks.