This rule isn’t actually necessary, it’s an old wives tale. You won’t get cramps or anything from doing so unless you’re horrifically overeating.
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Ah, I see. You gotta wait 30 minutes otherwise the pirate skeleton will kill you.
Tell that to the Lachrymose leeches!
Now that’s the kind of deep cut I’m here for! Watch out for exploding doorknobs too.
I didn’t wait one time and swam in the ocean soon after. The vigorous exercise got my blood pumping and when I got back on land, I immediately began feeling severely nauseous. There was no place to go and it was a fairly crowded beach so…I quickly began digging a hole and got about a foot down before unloading my entire lunch, then burying the contents for some unwitting kid to dig up later.
Joking aside, vomiting while still swimming could have been disastrous, so I got lucky on the timing.
I think this warning is true but only applies to actual swimming, not just being in water.
That’s just weakness leaving the body.
I think it’s because people would puke in the pool and they didn’t want to keep cleaning it up, so you wait 30 minutes to help prevent that.
Apparently the worst that can happen is (provided you are swimming vigorously) that the extreme exercise may inhibit digestion slightly.
Also remember rule 34.