Stupid Dumb.

[LostMy65]

I just searched thread titles for the words stupid or dumb. I hoped to find a thread on stupid dumb mistakes we've made. Couldn't find anything where we've had ongoing posts of stupid dumb things we've done.
Since I started this hobby, I've made several.
But I just did a dumb one.
I kinda blame my dad. Yeah it's his fault I've done this stupid dumb thing twice.
Never again.
30-40 years ago my dad said when he changed his oil, he liked to let it drain for a bit. Well twice now I've forgotten the plug.
Today, after draining the oil and removing the filter, I ran up to the parts store to buy oil and a filter. Got back home, crawled under the truck and put the new filter in.
Crawled back out and started filling the oil.
How many quarts should it take, 5?.
Hmm, 5 quarts and it still not showing on the dipstick.
I'm the dipstick who left the plug out.