I didn’t find a word that on its own echos this exact situation. However if you leave out the details, you won’t need a lot of words either, e.g.:

Oh yeah, awkward coincidence the other day — I ran into Sebastian McGillicuddy wearing the same T-shirt as last time lol. Hate when that happens.

But it’s certainly a more interesting and vivid story with the details you gave us. Much like Michael McGillicuddy’s infamous ‘Genesis of McGillicutty’ promo :)