I was eating at a family's house on Shabbos, and one the sons receives a dvar Torah to share with the family, along with two irrelevant riddles, typically halachic edge-cases. This week, the riddles were:
(1) How can you say 12/13 (I don't remember which) brachos on one fruit?
(2) What is an act that if you do it by accident, you say a bracha, but if you do it on purpose, you don't say a bracha?
For the first one, I immediately thought: "esrog". You say shehechyanu once and al netilas lulav six times, as well as lehafrish terumos and maaseros if applicable. Additionally, at least according to some shitas, you could make a shehechyanu on eating the esrog, and you would certainly make al pri haeitz plus borei nefashos. That gets you to 10. I thought of turning the esrog into jam and making two brachas over eating it, but that seemed like cheating.
For the second one, I was thinking during the omer, or eating non-kosher food... something along those lines. But none of those are exact, so I'm really not sure.
Any ideas would be appreciated! There was no answer key and I'm very curious.