Today our amusing word is a sad word. It sings a mournful song as it is spoken. But it is the mournfulness of a drunk person pouring his or her broken heart out on a sober person walking him or her home, a sober person who is half amused by the inebriated ramblings and the comical teetering and the prospect of the drunken companion's hangover the next morning. (At least in the movies, or novels, or whatever.) The word is: lugubrious.
Once again, an onomatopoeic word. The "u" sound is a drunken sound, and when placed after the liquid consonant "l", it is not merely drunken, but completely plastered by hard liquor. But look: it has yet another "u" in the next syllable. And it bears the ungainly, teetering "-ous" suffix. Lugubrious. Loooogoooobrious. Loooooogooooooooooobrious. Is that not pathetic? Is that not amusing? So mournful, yet so silly-sounding. That's "lugubrious" for you.