Manchester United -- Crash Seahawks Facility ... Terrible Passers, Amazing Jugglers

They're some of the best athletes in the world -- but when it comes to throwing a football, the guys from Manchester United proved worse than Tim Tebow.

A bunch of Man U guys -- including Memphis Depay, Phil Jones, Daley Blind, Luke Shaw and Jonny Evans -- hit up the Seahawks training facility while they were in town to play Club America in Seattle.

The guys got a tour from Seahawks stars Doug Baldwin and Jermaine Kearse -- who tried to teach them how to throw around a football ... but it was awkward.

Look, can't blame 'em ... it's not really their area of expertise -- but when they decided to juggle the pigskin with their feet, things got very entertaining.