Life Pro-Tips thread!

Everyone post tips that you think everyone should know about.

Instantly unplug a plugged nose by holding your breath as long as you can. If you hold your breathe long enough eventually you will feel your sinuses dilate... Voila! Clear nose.
On google chrome, you can press Ctrl+Tab to go to the next tab, and Ctrl+Shift+Tab to go back a tab. This saves me, as someone who hates using the mouse, and mostly uses his computer via the keyboard and keyboard shortcuts.
At a restaurant, add or remove something from your burger if you want it fresh. If you don't, they'll most likely give you one that they cooked a while ago. This works at fast food places too, but it has to be something hard to take off, otherwise the cook will take it off of an older burger and give that one to you.
Everyone post your own, if we can turn this into a really useful thread, we could even sticky it or something!