A pangram is a sentence that contains every letter of the alphabet:

• John P. Brady, give me a black walnut box of quite a small size. (48 letters)
• Quixotic knights’ wives are found on jumpy old zebras. (44)
• By Jove, my quick study of lexicography won a prize. (41)
• Sympathizing would fix Quaker objectives. (36)
• Jackdaws love my big sphinx of quartz. (31)
• Foxy nymphs grab quick-jived waltz. (29)
• Brick quiz whangs jumpy veldt fox. (27)

The 26-letter ones are nearly incomprehensible:

• Nth black fjords vex Qum gyp wiz.

Or “An esteemed Iranian shyster was provoked when he himself was cheated: an alleged seaside ski resort he purchased proved instead to be a glacier of countless oil-abundant fjords.”