Colts punter tweets 4/20 joke, immediately hit with drug test on 4/21

Colts punter Pat McAfee learned an important lesson about 4/20 jokes this week.

Pat McAfee got hit with a 'random' drug test on April 21. (USATSI)

Colts punter Pat McAfee learned an important lesson about 4/20 jokes this week: If you're employed by the NFL, you probably shouldn't make them, unless you like taking drug tests. 

April 20 is the unofficial worldwide holiday associated with smoking marijuana and McAfee celebrated by sending out a few pot-related jokes on Wednesday. 

I imagine Colorado being a bit foggy today.

— Pat McAfee (@PatMcAfeeShow) April 20, 2016

I can't celebrate this particular day..But I know a large % of my followers are..So happy laughter day 2 those of u snacking at a hefty rate

— Pat McAfee (@PatMcAfeeShow) April 20, 2016

Of course, one of the other jokes associated with 4/20 is that 4/21 is 'National Drug Test' Day, something that McAfee actually made a quip about. 

April 21st... Piss testing paradise

— Pat McAfee (@PatMcAfeeShow) April 20, 2016

April 21st: National Drug Test Day

— anthony CHARLES (@TonyThePilot_) April 21, 2016

The joke ended up being on McAfee though because he actually got hit with a 'random' drug-test by the NFL. 

When you tweet on 4/20.. Can't make this up pic.twitter.com/6hoasLoGML

— Pat McAfee (@PatMcAfeeShow) April 21, 2016

Moral of the story for NFL players: Don't tweet marijuana-related jokes because the NFL won't find it funny and they'll make you take a drug test.