Wandering Jews

I once had the “opportunity” to ride on a bus together with a large group of seventh-graders. There was an announcement that the recital of תפילת הדרך was imminent. One boy then quickly went around the bus asking everyone if they had any “extra” food they could give him. He explained that he had a מנהג to eat before saying תפילת הדרך. Now, there are people who call Judaism a gastrocentric religion. This, though, is a little too much. Is there a מצוה to experience motion sickness? Or was his request just a clever ploy to schnorr food?
Actually, there is a halachic basis for his request, sort of. Most “long ברכות” begin with and end with the formula “ברוך אתה ד׳ ...”. The ברכה of אשר יצר, for example, has the phrase ברוך אתה at the beginning and at the end. Some long berachos, though, have the phrase ברוך אתה only at the end. The second ברכה of bentching, for example, ends with ברוך אתה ד׳ על הארץ ועל המזון. However, it starts directly with נודה לך, without any preamble. Since the first ברכה of bentching ends with ברוך אתה ד׳ הזן את הכל, the proximity of that phrase to נודה לך, the next ברכה, obviates the need for another ברוך אתה preamble to start the second ברכה. The term for this is ברכה הסמוכה לחברתה. When one long ברכה is recited directly after another long ברכה, it may not need to start with ברוך אתה.