I'll take unopened envelopes any day over envelopes neatly slit open at the side so the contents must be pulled out and then somehow squeezed back in.  I always want to just throw out the envelopes but I'm afraid of the consequences from someone who thinks like that.  

Be careful what you say about sticky notes around IronMan.  Remember they were invented in Minnesota.  I think it was a scientist with a failed recipe for lutefisk.