I’ve done that on a few occasions, although it hasn’t always been confined to just gluing my finger to my thumb. I use superglue if I’ve ever split a nail near the bottom of the white tip and it’s effective and allows the nail to grow up until the split is near the top and can be filed. I’ve then stupidly touched something before it’s completely dry equaling finger stuck to jumper. Thankfully I’ve never touched my mouth while it’s been drying.
When we were waiting for my wife's trike to arrive last year, Royal Mail dropped and smashed the first two, while they were still at one of their depots, Basildon in both cases, I believe, and in the end I demanded that the supplier use a different courier, or refund the money and shove the trike where the sun wouldn't fade the paintwork...