Take wrong turns. Talk to strangers. Open unmarked doors. And if you see a group of people in a field, go find out what they are doing. Do things without always knowing how they'll turn out.
Randall MunroeI think the comic that's gotten me the most feedback is actually the one about the stoplights. Noticing when the stoplights are in sync, or calculating the length of your strides between floor tiles - normal people notice that kind of stuff, but a certain kind of person will do some calculations.
Randall MunroeWhen designing an interface, imagine that your program is all that stands between the user and hot, sweaty, tangled-bedsheets-fingertips-digging-into-the-back sex.
Randall Munroe