Fridays are fantastic. Everyone knows this. Fridays mean that there are 8 hours between you and a sweet, sweet weekend.
Fridays in my world mean all those things and something else- closing. Fridays are for closing. Every open issue, unanswered email in your inbox, request from a client or colleague, close them on Friday. Fridays are about making the last stretch of the week as productive as possible. Closing on Fridays is also about making sure your Monday is not already bogged down with issue that could have been taken care of on Friday. Every new email and non-emergency request that comes in on Friday can wait till Monday, or after the other issues have been dealt with.
Monday's have their own set of issues ya'll, close it on Friday.