If you've seen Deadpool right through to the final credits / stinger, this'll make more sense.
For those that haven't, here's the gist of it - Deadpool walks out in a bathrob in a similar fashion to the stinger from Ferris Bueller's Day Off, does the exact same line and then drops a few nods and winks to the upcoming Deadpool sequel.
It's a nice little reference and, to be honest, it was the best stinger you could have hoped for from Deadpool. Anyway, somebody's taken that and extrapolated it out entirely.
So now, we've got Deadpool's Day Off, a light-hearted comedy about a mercenary who can't be killed by conventional methods enjoying himself with that guy from Spin City and Mia Sara - all directed by John Hughes.
Take a look!