I recently had a flight where we landed on time and sat on the tarmac for 50 minutes. The pilot came on the PA and said they were "radioing the tower and no one was responding so they couldn't get anyone to move our jetbridge."

I kid you not, we sat there and the pilot BLINKED THE HEADLIGHTS repeatedly for about 3 minute intervals before we finally got moving. The pilot apologized profusely but it was clearly ground crew that messed up.

No thunderstorms, no delays, just a late-evening arrival (after 10 PM)